1) When a player in a multi-player game is defeated, everything is dumped in his discard pile. Is that discard pile still available for other players to aim card effects at (like fishing an ally out of it)?
2) If yes, can you use an event to resurrect one of that player's heroes?
3) If so, is he back in the game?
4) Can you similarly have him reshuffle his discard pile into a new draw pile?
This all would have been clearer had the player been out of the game and had all his cards "removed from the game" (unless they were under the control of another player).
Lee