User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-124.176.243.225-20121104095037

Hang on................. It`s been confirmed that the Insect controll rod can sap monsters energy...

So: Place the bug on a monster, it latches on and drains the monsters energy until it`s health reaches zero, then the monster explodes, which allows you to pick up bowgun ammo. You also get 1 destruction point.