Free Highperch Wyvern in Thousand Needles [CURIOUS BUG]

[Gonaro]

In Thousand Needles, while waiting for the respawn of Pao'ka (Homeward Bound quest), I saw something interesting: a Highperch Wyvern flying in slow motion. Here follows the screenshots:

[Hydra9268]

That was actually there in Vanilla too. For some reason Blizzard did that to that poor creature...