Plane teleporting upon being shot at in multiplayer?

I was flying on multiplayer and was following this guy for about 5 minutes (undetected), when I opened fire, he started zipping back and forth constantly (teleporting), I could barely follow him, at one point his plane almost crashed into mine. I managed to shoot him down, and the next sortie the exact same thing happened with the same guy (he only started teleporting when getting shot at).

Are there some sort of lag-switching hacks for IL2, or did the server just become overloaded when my hits were being registered? The other people I fought on the server did not teleport when hit.