Not the clue I was expecting...We know that we've skipped one clue from Wrestling or Rockslide, so one of the remaining words must be related. Because of that, I think we should guess Death first. It fits with all three of those clue words; people die in rockslides and wrestling, and all men must die someday. As for the other word...
Robin Hood is the name of a folk hero.
EDIT: On second thought, Bob could have deliberately overlapped Rockslide and Wrestling, say with Block. So, we can only be sure that we skipped a clue from Rockslide. So that really says "Death" to me.
Oh, and Batman is a superhero! I like that a lot more than Robin.