Kidnap one, you need information

You remember the shadowmagic that let you turn into some sort of smoke form, you decide to call it Shadowstep. You decide to use it to swoop in and and then grab one of them while they´re distracted. But then you´ll need a distraction.

You pull off a leaf from the tree and imbue it with some magic. Then you let it drop to the ground. While it falls slowly, you shadowstep down and around the group. Along the way, you repeat the magic process with several other leaves. You then trigger the magic you imbued in the leaves.

The leaves explode with demonic energies, leaving behind a chaotic aura. Sadly there´s no loud bang, just a bright flashing light. The group pulls to a halt, the priests and mages exclaiming over the sudden spike in demonic energy. The "heroes" with shields form a wall in the explosion's direction. Though they are, prepared, their rear is now exposed.

You prepare a pair of silencing spells, any target you snatch won´t be heard no matter how much they scream or struggle. So now the question stands, who do you kidnap?