There was zombie who could jump 20 feet in the air and I’ve got it on video!
It’s just one of those glitches that can randomly happen. With the newest Dayz Update, you may have noticed more zeds dead on the ground. I believe this is because they are literally tossed in to the game from outside normal view. Perhaps this was another instance of that with a twist.
Server: -=Hells Hideout=-