It seems that changing to ATTACk did the trick. I made one mission and told him to attack my target multiple times and game didn't crash. I'll run more tests and let you know if this is the definitive solution. However , it's good to know that this is an issue (Nobody signaled TK for this ?), I didn't know, I am new to SF2 and I am learning the ropes for now and asking a lot of questions until things are clear for me. I hope I won't bother you too much because of that LOL
UPDATE
I ran more ballistic tests and I can confirm now that game won't crash after this changing. Thanks once again for help and ideas.