PacketPlayOutCamera

Hi, I've been trying for a while to basically transform a player into a wither skeleton and I believe the only way to make the player 3 blocks tall is by using PacketPlayOutCamera. It works the player is now 3 blocks tall but they cannot move and when they try to, it gets weird like your player's arm just moves by itself and goes around the camera as you scroll. I read on the protocol wiki "(move packets will act as if they are coming from the other entity)" so does this mean if I read the wither skeletons packets and then move it based on the results it will work? And if so how would I go about reading a targeted entities packets?