ok so we play a tournament and we are down to the final table bubble, in one particular hand the flop comes down

, 3 way pot, the 1st guy bets out the 2nd calls and the 3rd guy folds, the turn is

it goes check check, the river is

, 1st guy checks 2nd guy chescks and they are on the backs 1st guy has 9-4 off suit, but the 2nd guy ( last to act ) shows j-Q ! the stone cold nuts!!!
Bemused by this , i actually say that if you have the nuts in the casino we played in, and dont bet out , being last to act it is deemed as collusion, ie cheating, to which the 2nd guy says but he is my mate , i dont want to take his chips!!!! now forgive my ignorance, but surely that is black and white and is collusion, disgusted that the dealer doesnt seem to know his right hand from his left, when i get knocked out ( bubbling) i say that i dont like what has happened , and only then do the staff do anything and remove the player for a full spin of the table.
What is your take on this , and what shoud happen ?