"Ah-!" Having to effectively control two bodies rather than one can make collisions a little easier, that much is true; Theo just about jumps back to avoid the oncoming run-in in startled shock, and his angel seems to fade for a split-second. Not enough to drop the books, mind.

Composure regained, Theo glances aside, a spot awkward under the gaze and brushes himself down. He wasn't expecting the question, though, and it takes him a moment to realise she's talking about - "Oh? It's a projection. In effect, an extension of myself." It nods to confirm.