Presuming the Pelosi's could afford insulated glass, the first blow is unlikely to break both panes. Tempered glass, required for doors, is quite strong. It would therefore take at least two blows. Glass from the first blow would fall on the same side as the impact. The second blow would still likely make the glass fall on both sides since the impact wouldn't carry much beyond the area it strikes.
What you say is true, but never underestimate the strength of a deranged person.