Carley could have just stomped on the head of the lone zombie
that was grabbing her ankle at arms length
Doug needed more immediate assistance.
Also lol'ing at people saying they saved Carley for any other reason than her rack. Maybe the firearm, but I bet if Doug was head shotting zombies left, right and center the stats would still show that the vast majority saved her. Look at the massive outcry when she died for pities sake, I certainly doubt it's because they missed her glock.