Upon teleporting a player relatively, the player's display flickers and their hand jitters. I'm pretty sure this is an unintended behavior.
I believe this was fixed in 14w02a and worked all the way through 14w30c. Then the issue came back in 14w31a, probably due to changes in rendering.
Related issues
duplicates
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migrated
Duplicate, I apoligize. Will remove.
EDIT: I don't seem to have permission to remove. And it appears it has been taken care of, thanks! 🙂