[Magic Fingers]

"I don’t think they deploy if you’re rear ended." Correct. Nor do they deploy on side impact (not the front airbags, anyway).

[historyrepeatz]

I’m wondering if his vehicle might have been propelled or flipped by the force of the hydrant’s water pressure. That would be equal to an IED, I would think. It wouldn’t matter what type of vehicle you’re in at that point.