I forget the penalty but you don't have to stay in the box. In fact, there's no harm in taking a minute to compose yourself, reposition the plane, climb if you have to, and then re-enter the box exactly where you want to be, ready to continue. In the lower categories it's encouraged over botching a maneuver or skipping one altogether and then zeroing everything after it. When in doubt, especially if below whatever altitude limit you had set for the flight, break from the sequence, get your head straightened out and get back at it.