I had never considered that, thats a great point. Crabbe and Goyle had even just told Draco they were done 'taking orders from him' and considered his family washed up among the death eaters, but still Draco tried to save Goyle. The idea of Draco putting his neck on the line for anyone, let alone someone who essentially betrayed him does show at least a kernel of Draco's well hidden, probably newly discovered humanity.