Aye, precisely! That's entirely possible! It all has to run on some sort of signal, which can divert shielding where needed, and if one finds that, then it's possible to bring the down. I don't know a thing about that at all, and it's not like I've technically DONE that before or the likes?
Quantum field theory. Typical shielding's based on gravitons, sub-atomic particles and the likes, which mimics the force of gravity. It's like placing a fireproof wrap around the stay puffed marshmallow man and then throwing firecrackers at it and expecting them to punch through and melt some mallow! Unless there's a hole made in the wrap, nothing's going to make it through, and he'll continue his rampage of New York, with no Ghostbusters to cross their beams and stop him.
If that made sense.
I can draw you a picture of how one would work, lad! Maybe over wee dram or two, if you're interested?