Again, simple physics would dictate that the wings would be sheared off, and if they didn't penetrate the hardened concrete, they aren't going to go backwards, which is what they would be doing if they ended up on the lawn. There's also the issue that if anything was flung backwards, the energy needed to change the trajectory 180 degrees is going to be high enough that any pieces are going to have to be necessarily tiny. Large pieces would have been torn completely apart.
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