All the other now considered was escape, and to that end he was exerting every atom of strength he possessed; twice had he brought his clenched fist into contact with the boy's head; but at such close quarters the blow was not nearly so effective as it would have otherwise been, and at any rate, it only caused him to clench his hands the more rigidly, until it seemed that, like the grip of the bulldog, only death could make him let go.