Question for you guys,
We were playing a game in which the party rogue happened upon a resting dragon (the dragon was awake in his den and just laying there...bored or daydreaming or whatever). The rogue made an insanely high stealth check and the dragon didn't know he was there.
Our party has a means of telepathically communicating so the rogue relayed to us what he'd found and the party fighter suggested doing a coup de grace on the dragon. The GM said "You can't coup de grace him, he's not helpless". I argued that the rogue could because the dragon was flat-footed and given the circumstance he was helpless (he had no idea the assailant was there and effectively was laying there with his neck on a chopping block).
So the question is, could the coup de grace happen or not? I picture this as a similar scenario in which someone sneaks up behind a guard and slits his throat while the guard is not at alarm.