CDGs for nested creatures: can someone coup de grace two creatures with one strike?

[aaron Ellis]

My players have recently stumbled upon an army of intellect devourers inhabiting the brain cavities of a tribe of morlocks..

Also, the Hexcrafter Magus in the party has recently gained the Ice Tomb hex (and I thought Slumber was bad).

Last session, the magus encased a morlock vessel in ice, trapping both it and the intellect devourer still in its cranium. The next round he CDG'd the morlock with an adamantine x4 crit weapon to its head.

At the table, I ruled that half of the CDG damage went to the morlock and half applied to the intellect devourer. Both creatures still failed their Fort saves and died.

I'm looking for advice on other ways I could have handled the situation. Any ideas out there?

[concerro]

CDG is not a called shot. You just make choose the target and that target has to make the fort save. Since the intellect devourer is inside the creature's body it can't be target for by CDG, and it won't die. I would just follow the rules which prevents this thing from happening.

Quote:

Damage done to a host body does not harm the intellect devourer, and if the host body is slain, the intellect devourer emerges and is dazed for 1 round.