There are all manner of security systems. Pelosi may not have had time to reach his phone, but had a button to push to alert authorities that something was up. At 82, it could easily have been a fall... or a motion detector by the broken glass set off a call ... or whatever.
I think the description of the perp wearing only underwear may well be a mistake, later retracted.
You bet, and it looks like the Pelosi's had none..
Kinda like they way they run government...Absolute chaos, where all their policies can be defined as sabotage.