I'd be surprised if anyone didn't expect that outcome. Since they gave him the ability to use foam a couple of chapters ago than he is fighting a dragon. "I wonder how that fight will go..."
IF you keep in mind that she is about 12 years old or something around that. Then words she said wasn't that absurd in the last page. But what is quite astounding is the fact that she was married off at such a young age.
Someone that attains a look like that is very unlikely to shoot up a school right after getting out of jail. More likely to look for some woman to fuck than that.