You were in s mission with Ghost. You two separated, going in different directions.. the doors were cracking... . It was the middle of the night with a full, bright white moon, so that didn't help much. Suddenly, you hear a raspy groaning, and shuffling of feet. It gets closer...until you see the tall zombie shambling closer to you. He's wearing a broken skull mask..and you know who it is.

It was Ghost who got infected...so he comes closer to you looking at you like you was a meal..