I've gotta side with Demi on this. At first, I wasn't sure if Plas would even be vulnerable to an energy beam. But in reviewing Mark Waid's "Terror Incognita" continuation of Grant Morrison's white martians story arc, I noticed that there's a scene where Plas gets cut, more or less in half by a martian's eye beams. Now, I figure this is some dime-a-dozen white martian, compared to the energy outputting power of the Master of Mutant Magnetism...The guy gets caps on his title fer crissakes! He can definitely put out a comparable amount of wattage. He can certainly kill Plas.
But would he even need to? Magneto's a bad guy, but he's not some crazy serial killer supervillain. Instead, he could easily just grab a whole mess of ferrous materials, and slap it really tight, like a fist, around either of the stretchers in question. No way they could get out.
And as far as his altering electricity...I think it's within the realm of the author as far as they want this power to go, but remember guys, it's called the electro-magnetic force. It's the same force in physics, and he controls the whole deal. Oh, but BlairWind...It don't matter how much of the EM spectrum you can control, you can't just whip up a black hole. That's something totally different. 😉
Still, those guys are tricky, and smart. I don't think Magneto would try to murder them. And frankly, though I love Magneto, he's awfully arrogant, and it's easy to get arrogant and slip up when you're fighting a pair of stretchers...their powers are, as they say, "mad weak". I'd give it to Magneto, 7/10.