Since DBZ suggested it, I'm leaning towards him shadowing the S-Rank healer. He knows it's the only way to save her, but he KNOWS these guys are going to be horrified to find out he can basically turn people into undead slaves.
They'll wonder how much of his army used to be people. It'll definitely get him branded a monster by some of them. Especially tiger-dude, because it's HIS friend.