Basically the emote breaks on the middle of the third "Hurray". The weapon teleports back to its unsheathed place and the animation stops abruptly. Specially notorious with book weapons.

Time: 7:12 CST 08 August 2014
Frequency: Every-time
World name: Balmung
Character name: Odiron Dulmare
Class/Level: Any
Party or solo: Any
Steps:
1. Be a Roegadyn M (Sea Wolf 75% Size Slider on my case)
2. Do /Huzzah
3. Watch it break mid-way.

The issue is not client-only since I had FC-mates confirm that it looks broken on their end when I perform it in front of them.