j'nuh
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The law referring to scoring is 15g:Law 15.5 The Tackled Player
(b) A tackled player must immediately pass the ball or release it. That player must also get up or move away from it at once.
(c) A tackled player may release the ball by putting it on the ground in any direction, provided this is done immediately.
... once you're tackled, those are the instructions. No player is permitted to have a second crack.
(g) If a player is tackled near the goal line, that player may immediately reach out and ground the ball on or over the goal line to score a try or make a touch down.
It offers no guidance on how many cracks you are allowed, only that whatever is done must be immediate. See the accompanying video: http://www.irblaws.com/index.php?law=15. Person hits deck and then reaches out. That is fine.