The younger woman finally spoke. She couldn’t have been more than twenty-five, with her hair pulled back in a quick ponytail and a diaper bag hanging off one shoulder. Her son was maybe two, sleepy and heavy against her, sucking his thumb with his eyes half closed. She cleared her throat and said it politely, the way you’d ask a stranger to pass the salt.

“Excuse me. Could you move your leg?”

He barely looked up from his phone. “I’m a big guy.”

“Your knee is in my seat,” she said. Her voice was steady, but I saw her arm tighten around her son.

“Then move over.”

“There’s nowhere to go.” She nodded at the end of the bench, where the metal partition pressed against her other shoulder. She was already sitting on the last two inches of plastic.

He finally looked at her then, and he smirked. It was a small smile, almost lazy, the kind that tells you a person has had this exact conversation many times before and has always won it.

“Then stand,” he said.

He went back to his phone. The young woman looked at him for a moment, and I watched her decide that it wasn’t worth it, not with a two-year-old on her lap and a long day ahead of her. She looked out the window instead. Two stops later, at Roosevelt, she gathered up her son and her diaper bag and got off the train. I don’t know if that was really her stop. I suspect it wasn’t.

A tiny elderly woman with a cane took her place.

She had boarded at Roosevelt, moving slowly and carefully through the doors, and she must have been in her eighties: five feet tall at most, in a long camel-colored wool coat that had been beautiful once and was still very well kept, with a plum-colored beret pinned to her white hair and a church bulletin sticking out of her handbag. She leaned on a dark wooden cane with a brass tip, and she lowered herself into the open seat with the particular care of someone who has learned not to trust her hips.

Within seconds, his knee was pressing against her coat.

She noticed. I watched her notice. She shifted toward the partition, gathered her coat around her legs, tucked her cane against her shoulder. The knee followed. She looked down at it, and then she looked up at him with an expression I recognized from a thousand patients: polite, patient, and just a little bit disappointed in the world.

“Sir,” she said, “could you give me some room?”

He sighed, a long and theatrical exhalation, like she had asked him to carry her groceries up four flights. “I’m six-four,” he said. “Where do you expect my legs to go?”

She considered the question seriously, as if it deserved an answer. “Just,” she said, “in front of you?”

Part Three: Nobody Asked You

I couldn’t stay quiet anymore. Twenty-six years in the ER, and I have stood between a lot of people and a lot of bad decisions. My mouth was open before my better judgment had a chance to weigh in.

“She shouldn’t have to sit sideways,” I said, “because you want two seats.”

His head snapped toward me. For the first time he really looked at me: a short, round, gray-haired woman in navy scrubs and a puffy purple coat, holding a travel mug with a sticker on it that said World’s Okayest Nurse. I watched him dismiss me in about half a second. I’ve been dismissed by surgeons with better haircuts than his.

“Nobody asked you,” he said.

“She’s asking you,” I said.

A few people in the car had started paying attention. The kids in the Bears jerseys had stopped talking. A man in a Northwestern sweatshirt lowered his earbuds. The woman with the grocery tote on the man’s other side, still folded against her pole, glanced at me with an expression that was half gratitude and half please don’t make it worse.

He leaned back against the window and spread his arms along the top of the seat back, like he was settling into his own living room. “If she’s uncomfortable,” he said, loud enough for the whole car, “she can stand. Give her your seat if you care so much.”

And then the elderly woman started pushing herself up. She did it slowly, with her cane planted on the floor and her free hand on the pole, a tiny woman in her eighties getting to her feet on a moving train so that a forty-year-old man could have more room for his knees. I’ve seen a lot of things make me angry in my life, but I’m not sure I’ve ever been as angry as I was in that moment.

“No,” I said, and I said it in my charge-nurse voice, the one I use when a drunk in Bed Four is trying to pull out his IV. “Stay.”

She looked at me, surprised. Then, slowly, she sat back down.

The man laughed. He actually laughed, a short bark of a sound. Then he leaned back even further and spread his knees even wider, until the old woman’s coat was crumpled against the partition and the woman with the grocery tote was practically hugging her pole.

“What are you gonna do?” he said, grinning at me across the aisle. “Make me close my legs?”

Before I could answer, the train pulled into Cermak–Chinatown and the doors slid open. A huge man in a work jacket stepped on. I mean huge, six-six at least, built like a refrigerator, in a canvas Carhartt jacket stiff with drywall dust and a hard hat clipped to his belt. He looked like he’d come off an overnight shift and wanted nothing in this world but to sit down. The car was full except for one spot: the narrow sliver of seat between Mr. Big Guy’s right knee and the woman with the grocery tote.

The woman with the tote, God bless her, saw her chance. She stood up, smiled at the construction worker, and said, “Here, honey, take mine,” and moved to stand by the doors. The construction worker nodded his thanks, turned around, and sat.

Instantly, the knees snapped together.

I mean instantly. It was like watching a pair of garden shears close. One moment, Mr. Big Guy was sprawled across three seats with his arms along the backs like a king on a throne. The next, the construction worker’s thigh was pressed against his, and his knees had pulled in so fast I heard the fabric of his good jeans whisper. He put his arms down. He pulled his elbows in. He sat up straight. For two stops, all the way to Sox–35th, he somehow fit perfectly inside his own seat, as neat and compact as a schoolboy in the principal’s office.

He did not look at the construction worker once. He did not say a word about being six-four.