"I am Dr G," He sneered at the bestial hero, despite the slight shortness of breath. If he let something that insignificant stop his dialogue, what sort of mad genius would he be? He slipped the large gem he was admiring earlier into his grip. The gem was rather large too. A polished quartz about the size of an egg. He twirled it slowly between his fingers. Hopefully, this little trick wouldn't shatter it. He rather like this one. It had potential. "Get this through your head, 'hero', I only surrender on my own terms. Nothing less. It's a part of being a mad scientist and a super villain. Along with have contingency plans. But more importantly, my dear Khymera; have you ever been to the disco? The light shows from the disco balls were to die for."
He pushed against her grip. He was not as strong as she was, but he was strong. Particularly when he put his mind to it. And since his abilities cancelled much of the force that would have translated to him from the pressure, he managed a small gap between them. It was enough to hold the gem cupped in his hands, angled towards her. He sneered, and used it as a focus for his power, channeling his heat ray with one hand and his freeze ray with the other. The gem flashed and glowed a pale red as the cyan of his freeze ray and the red of his heat ray mixed, before exploding into a spectacular, from both the visual as well as the potentially destructive perspective, burst of light; Red heat beams, Cyan freeze rays, Light Coral (so much nicer sounding than water melon guts) death rays in a kaleidoscopic display.