I watched a taken video from three seats of ships (AG,BB,SHOUNANMARU).
Each ship advances at an angle unlike different speed.
AG runs at high speed SHOUNANMARU and one minute to collide ago. AG ran with BB then. And, as for AG, slow fell in the side of the course of SHOUNANMARU. A long trail of AG comes out in the taken video from SHOUNANMARU.
When SHOUNANMARU approached, AG accelerated.
There is BB before SHOUNANMARU to block up the course of SHOUNANMARU.
BB does not stop.
Therefore SHOUNANMARU seems to have hit it on AG on the video which SS took from BB.
YouTube - Last moments of the Ady Gill before being rammed by Shonan Maru No. 2
YouTube - Sea Shepard's Ady Gil deliberately rammed by Shonan Maru No. 2
YouTube - Ady Gil loses bow to Japanese whaling vessel
YouTube - 沈没? 漂流するAdy Gil号 / The Ady Gil left drifting in Antarctic Ocean
YouTube - Sea Shepherd / Ady Gil - the continuum - PropagandaBuster