Trying out some Exotic pets and i saw the Froststorm Breath ability that Chimeras could cast.
I went to try it out on several "AoE" packs in Icecrown and according to the ability:
"Froststorm damage every 2 sec for 8 sec to to all enemies within 12 yards."
And since it says "all enemies within 12 yards." every npc should be damaged like an mind sear for example.
It's quite logical that a breath is usually a cone of element casted infront of the caster, but if the ability says "all enemies", then it should be all enemies.