[His assertion earns a smile, and she decides that there's been enough standing around inside and observing from afar. It's time to go back outside to get in closer.]

Could be a forcefield. Or some sort of temporal lock.

[Either way, she thinks destroying it may be easier said than done.]

A way of keeping us in a pocket dimension. Trapped with no way back to reality as we know it.

[With a little nod of her head, she motions toward the front door. Will he be going outside with her, or is she going to have to do some convincing to earn his help?]