Prematurely tabling cards in MTT

[Mano]

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In a tournament yesterday at the Borgata, Player A prematurely tabled his hand on the river before Player B had a chance to act. Before Player B could see what was tabled, the dealer covered Player A's cards with his hand. Player B then made his action, and the hand was completed.

I was not involved in the hand, and so I kept quiet. But did the dealer act properly? In other words, once a player tables his hand, even if done prematurely, isn't the hand now exposed for all to see regardless of what action remains?

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If it is heads up, I don't see why you would expose the hand. If there are more players with live hands, then exposing the hand may be proper so everyone has the same information. I played in a tournament in Wendover a couple of months ago, and their rule was that prematurely exposing your hand for any reason killed your hand, so YMMV (by the way, I think that is a horrible rule made by lazy staff).