After crushing it in combined arms this morning with a friend, we were invited to a crucible try hard lobby from the opposite team. Playing a few games with these call of duty styled players, the most whiney of the try hards mentioned that they knew of an icebreaker exploit that supplied themselves with "infinite special ammo". He then boasted that the above mentioned method was the only way he could "final round 85% of his K/D" by firing 2/3 shots at the ground, using his last shot for a 1 hit kill.
I don't suggest this method being a complete game breaking glitch, but bungie should nerf this.
While in crucible, die with the icebreaker equipped.
Before spawning back in switch to the preferred special weapon of unbalanced hate mail provoker.
Spawn back in and your special weapon should be locked and loaded.