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Playing a friendly 3 table tourney in a local pub.
Player A checks.
Player B bets.
Player A check-raises all-in.
Player B ponders and ponders and shows one of his cards to player A, hoping to get a reaction.

All hell breaks loose at the table cause some claim the hand is now dead.

What would the floorman's ruling be in a B&M? Isn't this the same sort of tactic as string-betting that is not allowed?

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There is no reason to prohibot this action in this case, but if you werere playing with TDA rules the hand would not be dead, but the player who exposed his card could be subject to a penalty (time away from the table).

Though there always seem to be a large number of people screaming that the hand is dead, I have never played in a casino that would kill the hand for that.