For the scene where he holds the two aleins together I don't think he'll shoot them with the cannon as this would cause a massive acid splash. Also didn't the first still come from this scene? Maybe he offs the one in his left hand then turns and thats where we get the first still from. Also I agree the whip scene and the Predalien scene look to be in the same place probably one after the other, but in one he has a mask on and when he gets spiked no mask so maybe the Predalien rips it stright off his face?