Judson snatched up one of Dick's mathematical textbooks, opening to one of the first pages at random.

Dick turned sideways in his chair, glancing up at the yearling with a rapt expression.
Yearling Pratt slipped into Greg's chair.

Holmes and Anstey stood on either side of him.

Pratt began rapidly to sketch out a problem that he chanced to remember from plebe year math.
Almost instantly the door swung open.

Not one of the cadets happened to be looking in that direction.