“I think I’ve found the worst feeling,” he mutters. “Helplessness,” says Spock promptly, like he’s thought about this before. “Being unable to do anything.” “Yeah, helplessness is pretty bad. But for me,” he says, looking at the picture they’ve put up of her, of Natalie and Sam posing together in front of the zoo, holding hands and smiling like the sun, “it’s knowing you could have done something. And you didn’t.” RegretTraumaFanfiction Book:You Don't Have To Source: You Don't Have To