He wasn't expecting that. His foot slipped when she caught him, and the momentum carried him along with her, until he was pinned in the corner, her hands and feet braced to hold him there.
He tried to break away, to push back, but the training she'd gotten in Torchwood against his weakened body proved too much. "Let go!" He pushed, trying to leverage his legs to use his taller frame against her, but his feet were caught up on the pages of the texts he'd thrown carelessly aside. Rage flooded him, and he turned to look at his captor--
And sagged. Rose again. Rose. He couldn't bring himself to harm her. "The numbers keep changing," he half-whispered, his voice thick with apology. "I... can't catch them. Need a net. Have to alter the gravitational constant of the universe. Squish. Collapse it. Could break a hole to the other side."