Believe it or not Kam, I do this with my heavy bag as well. I'm a fan of letting the heavy bag swing around wildly after it's hit because very few opponents are going to stay still and let you bash them, so I don't see a huge need to always have it held. So I let it swing and move around it, but often times I'll put out an elbow and a forearm and step into it and let it slam into them, as if an opponent is trying to lean on me, and I'll pot-shot it from the inside. I've also been thinking about sort of inventing a piece of equipment, making some little wooden arms for a heavybag I can mount on the wall and have the arms moveable for different positions of defense, which will simulate an opponent stuck on the ropes. Unlike when sparring it'll allow you to see and take apart different defensive positions with no movement before attempting them on a live opponent.
