Also showing us a crying healer chick means nothing, she laid in that bed when she decided to return to the students. She's oh so sad about 2 guys who literally helped kill several of her classmates and were decaying so would have died anyways at some point. Maybe she should have thought about all of this when oh I dunno she engaged in a genocide or when she sided and went with the class who kept trying to kill the guy she liked for no reason other then a "leader" who is trash. Absolute no sympathy for her.
You are missing the point here.
It looks like the "Divine Light" Claus, who was introduced in this chapter, is going to aproach the healer girl and proly use her misery/sadness to manipulate her to do something... stupid.
Edit: It's even possible that this guy is root of all evil, because, as everyone knows, church in manga = evil.
Also, Krusha raises good point here. It has been 400 years, if her and other members of hero's party were humans then they should be long dead.