Just stab it or something? Magnus pulled his attention away from the dragon long enough to shoot Hammer a withering look. He wasn't being particularly helpful and Magneto was seriously considering shoving the other man in the creature's path. Maybe the beast would choke on him and die and then Hammer would also be dead. It would be a victory for all of them. As Magnus contemplated Hammer's demise, the agonized dragon turned it's fury on Medusa, shooting a jet of flame from it's mouth towards her and then giving a pitiful but enraged howl.
Obviously, the thing needed to be put out of it's misery and Hammer would likely make a rather disgusting last meal, so the whining man's life was saved at present and Magneto devised some way to finish off their foe. He sent out a series of electromagnetic pulses to paralyze it and then, when it dropped to the ground, he gathered the jagged metal pieces that had been blinding it into a long spike that drove itself into the dragon's chest. It gave a final roar and then fell silent, it's body disappearing in the light of the teleport beam as the Mojomedia lackeys manning the teleportation removed the dragon from the arena.
Magnus lifted his face towards the sky with an amused expression and opened his hands wide with a shrugging gesture as he called out, "Well?" The monster was defeated. Were the masses entertained enough that the fighters (except Hammer) had perhaps earned their freedom?