At least in part this seems to raise an orthogonal issue, namely, who gets to play the cat - player, or GM?I'm not sure I follow your point ...
In my example, once the cat had been unleashed, there was no taking back the result (unless the cat rolled very poorly).
The moment would have been much less exciting if the player could have decided after they had their cat pounce that the worker wasn't killed.
4e tends to answer "the player", but there are some exceptions - Druidically summoned creatures with their instinctive actions, and the Quasit in the recent BoVD preview.
I've never played Sorcerer, but in that game I understand that the PCs' demons are always NPCs, to be played by the GM when the opportunity arises.
The point being, that there are ways to get the excitiement of the unexpectedly dead prisoner without making lethal damage the mechanical default - namely, by allocating responsibility for playing the various characters in the game in the right way.
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