OK, if he has a lock on you and you notch him, it wont make any difference if HE turns 20 degrees or so, you will still notch him. If YOU turn 20 degrees or so then yes you will re appear on his radar screen. Also, generally, if he has lost the lock on you, when he regains lock, it is unlikely that the missile will start to track again, he will probably have to fire another missile. I have seen this many times online in Hyperlobby