Long answer: because in a sequence of play that is so secret that it isn't actually published in the english language rulebook, reveal icons are resolved before hunt damage is resolved.
Ok, this brings up a new question. What to do when a reveal icon pops up and the followship is moving out of a shadow stronghold.
I draw a tile from a successfull hunt, it's a reveal. Since reveal icons are resolved before hunt damage do I immidiatly draw another tile before resolving the first one? Or do I reveal, move, resolve hunt damage, draw another tile from stronghold and resolve that?