Responses
The world is moving too fast, he cannot really take the time to properly mourn instead choosing to bottle it. Though, his friend's death will still stay with him for a long time.
As for the curiosity, it seems like he already got the memories from the time he was possessed in that one second
what? why everything was happening so fast?? im already in 15 chaps...no emotional monologue after his friends died? he didn't even ask or got curious what happened after his other self took over his body... ?