Ok, thanks Lusche. I'd never watched the film from the POV of the other tank, and from my tank it looked like a glacis plate hit.
Anyhow, it's still a bug. That turret ring hit should have killed the tank. Apparently it passed right through without registering, until hitting that raised part of the engine on the back side.
I've had other incidents in the past, which I hadn't filmed, where I would swear to God I had a round pass right through a tank's turret ring without registering a hit, and the other guy then killed me. In those cases the round impacted the ground well beyond the other tank, and so it just looked like a miss that happened to go right through the freaking turret ring.
Hmm. Well, anyhow, there's a bug here. Shots through the turret ring should kill the tank, not pass right through like this.
Thanks for pointing out the actual point of impact, Lusche.