[Mark McLeod]

The last (& first) time human pads were used during autonomous in 2003 the robot stopped if the human wasn't on the pad. Some teams actually used this as a method of deactivating their robot on purpose, so it would do nothing during autonomous.

I would suspect the robot might behave just as it would if the player stepped off during regular play. Stop and then continue if the player steps back on. In any case it's the way you design and write your code that will determine the action your robot will take.