from the promo it looks like some stray missiles did it but shin saw freedom shooting down at calamity who was standing on the ground next to where his family were so in his mind it was freedom that did it and you cant possibly think he cant find out from asuran or someone else that got the info who piloted freedom and kira cant possibly show proof that it wasnt he who killed them, btw how would he be able to remember a certain time when he shot at calamity he did that a number of times the first time they fought and they fought more than once. i know that mwu didnt fight rau's cgue but he fought him. and i expect kira to fight shin from what i can get it seems that shin wants revenge against the the pilot of freedom, i may be reading to much into it but he looked up ar freedom with some sort pf psycho angry look on his face.