[lmcclean]

As a dealer, and as the rules in my room (and every room I know of in this city) stand this is not considered collusion. As long as the players who are discussing the hand are involved in the hand and discussing it openly it is considered angeling. Angeling is considered bad form in most places, but I have never seen it result in hand being killed or any action being taken (my Casino and two others in town even openly permit it). One of the players could have had a terrible hand and was just trying to talk the other guy out of betting in hopes that he would catch up. Punishing a player for saying "check it down?" is as absurd as punishing a player for saying "I'm going to raise if you bet." It's all just table talk.
The only time I've ever seen collusion called is when they players are attempting to deceive the table by working as team. This clearly wasn't the case in this situation.