He tossed another book behind him and glanced at her. He'd been talking to her for a while now, but something looked different. "If I can adjust it to carry through void particles, through them without interference, then, then, then, if I can get a ten-point star-- no, no, not that. A diamond. I'll have to cut it. Just right. Then when it's done, I can mount it and cut a hole."
Another book was thrown. He picked up the next and midway through flipping pages he stopped, poked the text, and then took a marker from the floor beside him and began to scribble something in. "No, no, no! It doesn't work like that!"
Then he threw both marker and book aside and looked up, like a man having an epiphany. "I can change the flux of gravity. Yes! Pour enough gravity into the area, charged with something from the original reality. Oh! Me! Me! Once my own gravitational field collapses, it'll create a tear, and, and, and..."
He waggled an ink-smeared finger at Rose. "And I'll be goo. All squished and gooey and at the heart of a new black hole. But, but!"
He started spouting out equations in three languages. "And then you'll be home, and the tear will get his attention, and he'll come and you'll be there! But... he'll have only 17.3 seconds to close the tear before the black hole starts to leak."
He frowned, hugely and almost comical if it weren't for the mad look in his eyes. "No, no, no good. Need at least fifteen more seconds."