Tiger noticed that his attack seemed to do diddly-squat to the huge machine-thing. He then saw the combat between his comrades who had arrived to help him and the thing. It then transformed into this dino? He wasn't scared as he rushed it at top speed leaping onto its back and then running to stand atop its head, scratching at what had to be it's head. Hoping to distract it enough that the others could eliminate it.