Seems very likely to get interesting. The breaking glass could be the factor that makes a viable self defense argument. Breaking glass isn't how a lost or wayward person knocks on the door seeking directions or other help. Breaking glass suggests an intent to illegally enter and hypothetically engage any resident inside.

How this is handled would vary widely by state IMO. In Texas, the south, or Rocky Mtn. states, it would probably be a clear and simple self defense ruling. In WA, CA, MA, CN, and other liberal states, maybe it's not so clear when perps have rights while breaking and entering.

Sg