I was playing on Crypt and I was infected. What happened was a player with an Energy Sword killed me twice. He was greenish color with infected effects. The sword was also green. I thought there was an Energy Sword on the map, but I don’t think it’s it there and that Spartan had infected effects. Guess this is a bug that needs to be fixed.
A spartan can get the sword by assasinating an infected. I’m not sure if the armor affect carries over.