Yea that's a little shocking. I know they've omitted Angel of Death a few times but they've always played Raining Blood and all four members have stated its their favorite song to play live.
Maybe they were told they needed to cut their set short mid set and just thought fast.
the fuck you know about French Montana you old son of a bitch!? Trying to fuck my niece to that throwback 90s slow-jam shit?