It is to complicated for me to explain well but if you hit someone with the proc, glow and then run away the weapon has an instant kill effect. I can't tell you how to reproduce it. Several wars have figured it out and you could see examples of it during yesterday's clashes. If you want ign I can provide that privately. Idk if it's a bug but instant kills usually are. On a side note watching 3 tanks proc and then run away is funny.