Upon zooming in at the exact moment dolly hits the bus window, you can clearly see the synchronized explosive charges detonating indicating a controlled demolition of the window. Several respected engineers have come forward already with sworn affidavits.
Turns out owner of bus had just placed a new insurance policy on bus windows so he ended up making thousands after the windows shattered. Also, a crazy coincidence that windows had asbestos in its composition and would have required bus owner to replace at his own expense, had this accident not happened. Instead of having to pay for removal, he got paid by insurance.