kaleida

Hi I went into Rentar's Keep with Kabraxas and the other 3 vahnatai. Then they wanted to rest in front of the door. As I was low on health I went back to Fort Remote to restore energy. When I came back to finally fight Rentar Ihrno Kabraxas and his team was gone? There were no enemies left on that level that could have killed them. Any ideas? Also does it make any difference except for the difficulty of the fight?