Ok, so while him jumping ship is absolutely a dick move (Before anyone mentions how he was summoned because of experiments involving Mashu: Remember, Servants can reject an attempted summoning, AS SEEN WITH GALAHAD HIMSELF DURING THE CAMELOT SINGULARITY), It’s implied he knew about the (then) upcoming Lostbelts, at least since we (canonically, btw) beat Goetia to death with our bare hands, and yet, he didn’t think to tell anyone that “Hey, so there’s another Beast coming and it’s gonna try and do what is essentially a HGW on crack.”, even though we know from Midnight/Lostroom that he can possess Mashu?! WHY?! IF HE KNEW, WHY DIDN’T HE TELL ANYONE?! Is it because he thinks we wanted this to happen? Does he think that we had a choice in whether or not we fought through the Singularities? News Flash, asshole! WE HAD NO CHOICE! EVERYONE, EVEN SLIGHTLY MORE CAPABLE THAN US AT OUR JOB, WAS DEAD! THERE WAS NO ONE LEFT! HELL, WHY IS HE PINNING THE BLAME ON US INSTEAD OF THE BEAST/I-HOPE-IT’S-JUST-TYPE-VENUS RESPONSIBLE!