checking it down with an all-in player on the side

[Chris Daddy Cool]

okay, so player A, who is tilting and tired and probably just wants to go home, open-pushes all-in for $80.

i fold my hand. then next player to act, player B, thinks for a little while and makes the call. his buddy, player C, sitting next to him, really wants to make the call. he asks player B if it is okay for him to call. player B tells him to do whatever he likes. then player C responds by asking "do you just want to check it down?" player B says "okay." and then player C makes the $80 call.

now at this point, i seem to be the only one paying attention to the action and i point out to the dealer quite sternly that player B and player C just agreed to collusion against player A and this should not be allowed to take place. the dealer agrees and says "yeah you guys can't do that." but does nothing to enforce it and player C is allowed to make the call. everybody else folds and player B and player C check it down post-flop.

what should have happened?