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The right effect of Stealing is the following: "Draw 1 random card from opponent's hand, or discard 1 card from play (except from opponent's RC)". This means you can choose to discard your Rattlesnake
Alan Pinkertoon + Dynamite: is the opponent's AC also the target of three hits when Dynmite explodes in Alan's face ?Yes it is, provided that Alan is still alive after Dynamite. Infact, as a rule of thumb caracters ability does not trigger when they lose their last life point.
Hope this helps