In practice, this isn't going to happen. The only violation that I can think of that could possibly happen during a try is swinging the elbows (or leaving the playing area for an unauthorized reason, but isn't that still a T in fed?). 3 seconds isn't applicable on a try, and a kick would be utterly rediculous on a successful try.
As for the elbow thing, I've never seen anyone even come close to this violation who didn't have the ball.
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