The bomb did blow it out. It just didn't have enough force behind it to break the plastic in the windshield.. Gravity is the reason it is sagging back in the car.
Also, the polyurethane glue that is used in windshield installation is about the same consistency as your tires when it is cured.. No way the full windshield would be blown out with that stuff holding it in.
I have no clue if there are bullet holes or not, none of the pics I have seen are detailed enough to tell.
The windshield damage and side window damage are consistent with a medium force explosion from inside the car IMHO.
(Former auto glass installer anon)