What if we reversed the roles we play in escort missions? What if you could play a game or section of one that had you control a character that had to be escorted? Apart from the difficulty of building the AI, I can’t think of a good reason not to implement such a sequence. Just think about it: You could be controlling an annoying little brat that makes life impossible for the “protagonist”. You could be playing as a helpless character running away from scary people and letting your guardian deal with them. You could be just a sidekick admiring how awesome your mentor is, while unconciously learning the strategies that you will be able to pull off later in battle. You could be a prisoner of a magical being, but still retain some freedom of action, enough to make his life impossible and possibly break free at some point. You could be a virgin being lead to the sacrifice chamber and your goal being killing yourself under the watching eyes of the guards.
Image taken from here.