I shoot right handed so my gun is up on my knees with my left hand in shooting position. I have the stock on my shoulder and my right hand reaches below the stock to control the trumpet. I play the trumpet with one hand, mostly just doing soft clucks. From there I can drop the trumpet at any point (it's on a lanyard) and reach my hand up to the trigger, the little bit of motion is hidden behind my knees. Usually though, when they are that close I've already stopped calling well before that point.