@Moridin69 or the golems he uses to deactivate the traps which become fighting power for the dungeon, or the discussion of the three groups which is allowed to go first.
even if the hero didn't knew they sacrificed his friend, there is no way to know how he would react when one of his close friends dies. even more so since he comes from a relatively peaceful world where it's rare for people to die a unnatural dead.