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this may be a play by the offender but more than likely he acted out of turn and left the decision up to the SB to bet any amount he could. He exposed his hand and this could have been very costly for him, luckily he was winning

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That's not what happened. SB was ALREADY all-in. Offender did his little speech to find out if offender should call or fold. If Offender turned over the cards and SB indicated that SB beat the hand, Offender would claim "I was trying to fold." But since SB showed weakness, Offender was able to say "I call" at the end.

I would definitely institute a rule making this illegal from now on. Let him win that pot (he did win it because SB mucked). But from now on, you can't show cards until you've verbally called.