Snowballs Aren't Fun

http://images4.wikia.nocookie.net/__cb20060829235312/wowwiki/images/thumb/d/d4/Inv_ammo_snowball.png/85px-Inv_ammo_snowball.png	Defeat Glacius before he uses Snowball 10 times.	10
*Since he has a maximum of 9 to get this achievement, you have a little over 3 minutes to achieve this.