Warlord Player's job is to tell other players what to do??

[Simon Marks]

Sure it does, golem's don't die from a big sword - they were never alive.
The undead don't die - they were never alive.
Devils don't die either, it's Immortal. They can get Destroyed.

But there is a difference between Destruction and Death. One is Biological, the other is Physical.

 

[Wormwood]

Certainly, but it depends whether the "A power which affects 'an ally' may always be declined" is expressed as PC-only or not.

But practically, since the DM is the guy who makes that decision, does that really need to be spelled out?

 

[Mustrum_Ridcully]

But practically, since the DM is the guy who makes that decision, does that really need to be spelled out?

Not from the versimilitiude/realismn/simulation point of view. The Devil is not interested in dying by exploding himself, so he'll try to avoid it.

The flavour text name of the ability ("Iressistable Command) implies that the Devil might not have a choice to be "unallied" in this situation. But what the RAW says, is unclear.