pitty marcus on the last scene where john connor is dying. in his head, marcus probably saying 'owh crap, am i suppose to give him my heart? OMG i know im a robot but i want to live... argh crap ok2 i'll do it!'. i mean, it is quite obvious that he's the one that suppose to sarifice at that time and moment and i think it's quite unfair. IF he didnt give it, people might say he's an ass or something. poor marcus.