So AK bet out 400 post flop ?
J9 then went all in for 2,400 ?
AK would have to put in another 2,000 to call ?
Hmm, if I was holding the AK, with just a gut shot, I"d have definitely laid it down, although it would have left me short stacked (10 x bb, or less). That"s not to say that it"s definitely a bad call, I"d also have to take into account how the player with J9 had played up to that point.
Not sure why the player with j9 went "mad". The player with AK must have had a valid reason for calling, and hitting an A on the turn or river to win the hand can hardly be considered a bad beat......