[His first reaction seeing the creatures was to feel nostalgic. The second, to figure out welp, he was fucked, he was going to die with no Maze to watch over him and no brother to get him out of trouble if needed...
Only then he got hit by one of the creatures, and nothing happened. It bounced back. So hey, maybe he's not exactly mortal at the time? You might find him just as he comes to this realization, grinning like a maniac.]
Well, well, look at that! Things are getting interesting now!