If a command block is rotating the player's head while s/he is in the chat, the player's head can rotate through the player's body.

What I expected to happen was...:
The player's head would stop rotating after looking down.

What actually happened was...:
the head would continue to rotate, causing a graphical glitch.

Steps to Reproduce:
1. Create a fast Redstone clock
2. Connect a Command Block to the clock
3. Put the command tp @a ~ ~ ~ ~ ~10 into the Command Block
4. Enter the chat