People are honestly really understanding of those who prefer not to watch someone vomit. They don’t expect you to stay and watch cause they think it’s gross too. They probably weren’t thinking about something like you not getting help. They were probably a little preoccupied. And like you said, someone was walking back there anyway. You asked if they were okay, and that was probably as much as anyone could do for someone if they were vomiting in front of them. I’d say you’re good, and it’s not like it was an emergency situation