I don't know about rigged, but the system makes absolutely no logical sense. If I take out the enemy sails, it still says the enemy ship is moving. I've had the ships pointed in opposite directions and yet they remain at the same range from each other. I guess they're circling each other? If I fire enough grapeshot to butcher the entire crew many times over, the enemy almost instantly recovers and keeps firing with the same efficacy. If I break contact then quickly re-engage, the enemy is completely repaired. It's getting silly.