littledetective:

                                                                 Now I see why Hattori hates this guy —
                                                                 he’s a jerk if you’re not a kid.

Out of faint paranoid, he reached up to
   make sure is hair was flattened while
   listening to Hakuba talk about his
   methods. “Look, I wasn’t trying to kill
   him. And I’m sorry is I’m not up to the
   Great Hakuba’s standards.”

“’Not trying to’ doesn’t mean much if someone ends up dead anyway. It has nothing to do with whatever standards I may have, any method of trying to catch or get revenge or such that has that as a possible end result shouldn’t be used… How would you feel if he hadn’t had that thing influencing him to bring him back?”

He’s just miffed because of taking the death lightly, and of a Kaitou at that. The strange world and magic might have kept it from being permanent, but that doesn’t mean it should be brushed off.