My understanding was that the older son did hear it and was able to call for an ambulance I met the guy once, he is in his early 20's, so its not a child that will grow up thinking he killed mom.
I don't know the whole story yet either, I expect details to come out as the week rolls on.
The thing that really stands out in my mind is that the bus driver was charged. If it was a simple accident then there shouldn't be any charges, but if the guy was drinking or actually negligent in some way then yes.
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