Look at the pictures. Those buses typically don't have a "back" window (the very back panel of the bus is not a window). It is not very clear in the photo of th

Look at the pictures. Those buses typically don't have a "back" window (the very back panel of the bus is not a window). It is not very clear in the photo of this article but others show very clearly that the smashed window was on the side, near the back, just above the rear wheels. Driving at freeway speed with that side window smashed out would be very windy and cold in that bus.