If a player is eliminated then according to the rules all of the cards he controls are removed from play/sent to owners' discard piles. What about cards that are owned by that player but controlled by another player, such as an attachment. Do those stay in play? Looking over the rulebook there doesn't seem to be a mention of other cards owned by that player.
If they do stay attached, what happens if they get removed. Since the other player is eliminated his discard pile is removed from the game already. Does the card simply leave the game completely then? This seems the most likely thing, but it is a weird interaction.