Felt very disappointed by Nagato, I know the violence isn't always the right choice, after all he only saw them struggling, but after what Fukunaga said "remembered that time" referencing to almost being raped... I'd deck Hibiki, forget he was Fukunaga childhood friend and continued till he end up in ICU. That kind of behaviour has to be taught by leaving scars, as much what Fukunaga has after what almost happened to her.
The forcefully biting Fukunaga lip by Nagato, seems also out of place, she gone through a lot just now, it's emotions that went through his head but that's kinda fucked up... she went through a sexual assault just a moment ago so Nagato went on rough foreplay even if she told him about resurfaced rape attempt... that wasn't "romantic" at all...
Can understand Aya actions, she wanted Hibiki to comfort Fukunaga and see him fail, but couldn't foresee he would end up assault her like that.
Fukunaga even after what Hibiki did told Aya to check on him if he is alright, reacted too good for him to be honest, guy deserves to be thrown to jail for such an assault but left with just a slight bruise after her slap.
Thanks for the scanlation!