Hi, my name's Harry Dresden. I've been a wizard since I was 10.
And this freaking bubble is pissing me off. Wizard-mode engaged, I'm about to do what I do best: formulate really bad plans.
First guess was that the barrier was a mutated version of thaumaturgy. Which in wizard speak means that if you do something on a small scale and feed enough energy into it it'll happen on a large scale. Think a map of Indiana with a circle around Madison Valley and something funneling energy into maintaining the integrity of the circle. Except the actual effects are happening to us here. The types of things that can bring us here and feed energy into a circle that big means we should just quit life while we're still breathing because we're screwed.
Second guess was a magic circle. If you wanna see a demonstration of that my apprentices or I can show you. The center's the focus and used to contain things, or sometimes keep them out. But there are mortals here who can't get passed it, and that breaks every law of magic that I know and understand. If there are any practitioners who have a different experience it's time for show and tell, kids.
Who wants to show and tell anyway? Most people go out on Friday nights, I wanna play with your magic. Sue me.
Anyway. I was theorizing that we have a series of different practitioners and science types who understand the laws of physics and energy manipulation to some degree. So, maybe we could combine our strength and funnel energy into the barrier to knock it down. Depending on the spellcrafting. I've been testing the stupid barrier and a lot of magic gets absorbed, but the physical objects get thrown back with equal force.
The problem being that if the spell is reflected instead of absorbed, the expansion of energy will level a good portion of the area. If not the whole town. To counter that though, we could do a working where the barrier meets the river. Since I heavily suspect that's the weakest point. We can ground the reflecting energy out into the river itself, since water washes away energy.
Grounding energy into the earth would probably cause a quake and knock some buildings down or something. Not eager to do that. I have a clean record so far.