Question on Behavior in Tournament Play

[Forbillz]

For the second question, it's called "implied collusion". It is somewhat common courtesy to check it down when both players have a third guy all-in, you should check it through...the thought being, when you knock him out, you both move up in real money, which is more valuable than the chips at hand. Exception: If you have a hand that is not really at risk of losing to the all in guy, some sort of monster, you can then ignore this, and go for the jugular of the other guy.