Question:  Is it correct poker etiquette to check down against an opponent when you are both in a pot against someone who's gone all in as a short stack?  I've noticed more and more often that in PSO tourneys, this does not happen.  Should it happen?  What about if you are ITM already?  I always played that the goal is to knock someone out of the tourney, in order to move up the money standings.  There is a better shot of doing this with multiple people in the pot against the player who is all-in.

Am I wrong for thinking this?