I don't think you even need to handle it. Keep cover, check for other bad guys. If all clear, keep the downed perp covered and move up and kick it clear. Open the distance again and wait for the authorities to take control of the scene. When they arrive, personal weapon holstered or on the ground follow ALL instructions, whether you agree or not, until they sort things outI think it's pretty simple here. Clear the weapon, toss the ammo way far away and DROP IT.
BehindBlueI's advice is on point - because of who is giving it and because it makes sense