Kelin's Lucid Lullaby

[seitil]

So I have been just starting to kite some larger packs on my bard and I am a bit confused about grabbing packs with casters. I just picked up Kelin's Lucid Lullaby and grabbed a few mobs from another camp and then ran by to lull the caster in the next camp and it seemed to start casting on me as I ran through to add the mobs to the pack. Do I need to have higher charisma or am I just not understanding the mechanics of the spell?