“Elwin's eyes widened, then he shook his head. 'Nah. Couldn't be.' 'Couldn't be what?' Sophie asked... 'That sounds like what happens when someone does a brain push...'”
A Brain Push is a skill of Telekinesis only ever known to be performed by the Ancients and Sophie Foster. Brain pushes use mental energy instead of core energy. Sophie uses brain pushes throughout the books, such as during Fintan's healing. Her brain push also slammed both Fitz and Sophie against the walls during a Splotching match. This was because mental energy and core energy don't mix, and instead they rebound when they come into contact with each other. Before Sophie, only Ancients could perform such an incredible feat.