Oh no, suicidal implications. Shun doesn't seem to value her life at all, huh.
Yeah, she's always been quite self-deprecating, but this is fairly concerning. And Hinata's instinctive response being to get angry at Shun really doesn't help . . .
It could be that her response to almost drowning will be fleshed out more later (a delayed response to that sort of thing isn't uncommon, after all) - she was distracted almost immediately, so even Hinata's anger was short-circuited. Maybe later on it'll actually hit her, and she'll collapse or something like that . . . Hopefully while Hinata's around to give Shun comfort, but also to remind
Hinata that this was something scary and almost tragic and that the correct response is comforting not getting angry at someone for taking risks . . . Having a bit more association with the kid and her mother is also good, it makes it more likely that Hinata will recognise that Shun taking that risk to save the kid was actually a good thing.
Or, I guess, it could just not be written as carefully as we'd like, and it'll all just wash away in the glow of the fireworks . . .