[@Hellis]
Okay, I don't like criticizing other people's posts, but I feel like some questions need to be asked.

1. How did he realize what she needed was in the bathroom?
2. How did he know what he found in the bathroom was actually her stuff, and not somebody else's?
3. Even if he does have experience as a drug dealer, how would he know that she needed medicine? Based on what was written about her, it sounds more likely that an observer would decide she must be having a panic attack.
4. He walks into his diner, and while some strange things are definitely happening, there's no immediate danger... yet his first action to pull out a knife?
5. Based on what you described, he went into the restaurant, started yelling at people, then ran into the bathroom, found the items that he somehow knew were hers, got out, and then told the girl he found her stuff. You're not really taking into consideration the fact that someone might try to stop him, talk him down, or interact with him in any way between when he enters the bathroom and when he begins to interact with Jill.
6. Since there are other people who are much closer to the bathroom, any one of them could easily grab her stuff before your character does.