The voice came from behind them; they all turned all but Sir Isaac who did not need to turn his body.

Sir Isaac backed his head out of the eyepiece rack.

He stopped outside Sir Isaac's study to blow his nose and pull himself together.

You see, Sir Isaac was in some fear of assault.

Sir Isaac's laws seem to offer the most promising possibilities.

All he got out of it was a bruised hand; Sir Isaac made no response.

Sir Isaac stepped up the magnification and shifted to another sector.

Or had Sir Isaac simply found out where he was and sent for him?

Sir Isaac paused as if he found the choice of words difficult.

Don showed up, along with apparently every human in the place and about half of Sir Isaac's numerous family.