Lol, if I were the guy who had zero experience with these grail war shenanigans, my brain would probably shut down. I mean this guy just saw hundreds of dead people the first night he went back, some with brains splattered, some with their bodies disintegrated, etc. He just randomly went back in time ffs and now he's gonna have to deal with murder servants, your grandma in teenage form, nazis, a world war, and massacres. Gonna need a few weeks to adjust to that. Can't expect him to think rationally when irrational things keep happening, that's just shit thoughts.