Double Trouble Bang Wand
You hand your magic wand to your little helper, but you still have one in your hand. You say: "En Garde!" and start fencing with him!
When gets the knack of it you surrender (before he injures you) and hand him your sword. Rather, wand. Then the wand goes off with a BANG and you really get scared and stick up your hands to surrender.
The BANG noise is created by a mechanism in your hand.
The above wand the works are retained by you as
you hand over the wand. Load with plastic caps