I have looked at the impressive if rather unpleasant video of the ship being torpedoed a few times now. I make a couple of observations. Firstly, the video is presumably being taken from the asset tracking the ship as it has static crosshairs. Secondly, the asset is moving to the aft of the ship at pace. Thirdly, at least two separate explosions are visible; the initial strike which raises the stern of the vessel (a lot) and there is then a second flash and column of water just in front of that. I don't know if this is a second strike or a magazine or weapon of some sort that has been detonated, but I'd favour the former.