WitherSkull's can turn blue. Who knew?
Modify the Y value of spawns. Let things spawn more logically. Read desc

Bat now spawns at your head.
Entitys which are otherwise unseeable or would 'break' now spawn higher
to prevent this
Read desc

Now send a look packet for Wither skull to prevent it looking up.
Send the velocity packets if this criteria is meet (Send when on ground)