Issue Description:

Elytra falling through world bug: I was playing around with the bound armor elytra upgrade to see how functional it was, and decided to lay under a block of managlass from botania, I then looked directly up/down and my playermodel then proceeded to slip through all collide-able terrain straight to the void

What happens:

Looking straight up/down when elytra-planking under a transparent block you lose collision properties and fall through the world

What you expected to happen:

Nothing in particular, especially not the falling through the world bit

Steps to reproduce:

1. bound armor + elytra mod
2. Elytra plank under a transparent collide-able block
3. Look directly up or down
   ...
   ???. Pain and no profit

Affected Versions (Do not use "latest"):

• BloodMagic: 2.1.8-77
• Minecraft: 1.10.2
• Forge: 12.18.3.2239

Again waiting for Forge elytra implementation