Glitch: skill A pluck of many doesn't work correctly.

[Razzr]

Maybe I'm missing something here but very often when I use the skill A pluck of many that should spawn copies of myself fighting with me it doesn't do anything. I use it, it takes the mana cost, goes into cooldown immediately but doesn't spawn any copies of the hero.

Anyone knows if it's a real glitch or am I missing something here?

[Houstonheart]

When you cast a spell and are interrupted you loose it, make sure you don't get hit.