It's that pain in K's voice that stops him. His friends, when they're worried about him and trying to do something nice for him, get angry with him. He's prepared for that. He's wrongfooted by such direct, empathetic kindness.

"I want you to be comfortable, too," he says, a tad helpless about it. If they're going to break the law together--and they've already agreed they will be--he wants to take care of K how he can.