So the Marvel Heroic Roleplaying initiative system is great - there's always some asshole that has spider-senses or super-speed and goes first, then they get to pick who goes next, until everyone's had a turn, then the last person on the turn picks who goes first at the start of the next turn.
It's easy for me to decide what order villains go in once they get picked (smart players will not take all their turns before the villains because the villains will then get 2 turns in a row, for example), but what about allies?
Let's say a bunch of my supers characters are fighting one of my villains:
Jet, hip hop speedster
Isotropia, Jersey Shore mistress of magnetism
and Jammer, fast talking career girl who thinks she's one of the boys, hobnobs with some smooth talking heel reporter named Biff or Smoocher or Smitty
And they are fighting
Makkala, the Hawaiian shirt wearing volcano god
Mai Tai Mai, the bikini wearing henchgirl of YOUR DREAMS
Yain, the alien cannibal chef flim flam artist and confidence trickster
And helping the heroes is:
SHIELD Agent Johann Amadeus Sutherland, the only guy still on the Kingpin case
So obviously Jet goes first. He slams Mai Tai Mai with a super fast fist punch for some physical stress.
Jet picks Johann to go next.
"Not so fast, Agent-Fool!" I yell, and spend a point from the Doom Pool to let Yain interrupt and go next. Yain deploys a pepper spray bomb to do a small amount of physical damage to everyone, "it's basically a food product! hahahaha!"
Interrupt over, so it's Johann's turn and he fires at Makkala, but doesn't succeed, Makkala is too tough.
Now....when I, the GM, decide who goes after Johann, should I be making that decision as if I were Johann's player, i.e. I should pick someone who is best for the heroes, OR, should I be making the decision "as the GM" and picking characters that will make things harder for the heroes?
i.e. if I think Isotropia going next is a good strategy for the heroes because she might be able to take down Mai Tai Mai (or Shutdown her Power Set by yoinking her machine guns out of her hands), then should I pick her, OR should I pick Mai Tai Mai next because my job is to kick the heroes around and make things hard for them?
Help me out here, what's the best idea?