As The Wolves (a group of people) were able to get into the walls of Alexandria..as you were out killing all the wolves with carol but..she had told you to go back to the house since judith was there and carl was too and since you were good with guns snd many things..you were able to protect both of them so you went our way there as you just walked through the door..carl was right by the door and as soon as you walked in..you were met with a gun..which was carl..