Monsters may attack the summoner as well, afaik (otherwise it would be explicitely stated in the rules).
Hmmm since in our first game the boss+stone were teleported to the exit, we never thought about it, but I guess the new Summoner still runs the risk of falling off the Ancient Bridge, swimming across the channel or getting caught in the Portcullis room, etc?
(I didn't raise this as a separate question as I figure it's the same as the question about fighting the monsters)
Ohh ohh does that mean that special room that inhibits powers (Cursed Stone?) shuts down the Summoner's red ability as well?