So that's disappointing. If you have rank 3 of the Intimidation perk, as you may know, you can pacify humans, and force them to fight, as well as to follow you, and even trade items with you.
What you unfortunately can't do however, is tell a pacified raider to get out of their power armour.
I just came to defend the Slog, to find it being attacked by a group of raiders, 3 of whom were in power armour. I really wanted to get at least one of them out of the frame, so that I could leave it for the people in the slog as a defensive item. No real benefit to that, I just fancied doing it.
But despite finally getting one of them to be pacified, and not killed by all the other explosions going on, I couldn't get them out of the frame.
Nor could I force them out by pickpocketing their fusion core.
And I wasn't even having luck in shooting the fusion cores out of them. Each time the cores went critical they stayed inside the armour, either dying in the explosion, or carrying on at a crawl.