It sounds like the damage is to the ends of the frame horns...that the bumper was pulled down hard enough to make the bolts that go into the ends of the horns rip free.

IE: the horns broke, so the bolts came out when the bumper pulled on them.

I have trouble imagining this, as the three points per horn are kind of tied together, and its a 3/8" steel plate connecting them....so if one moves, they should ALL be moving...

One thing I can think of that would allow that kind of independance is if the holes were slotted, and then not adequately tightened to prevent slippage?

There's no way the 3/8" plate bent with a pull along its length/strongest orientation...so a pivot relative to the frame is all that can occur.

What's really odd is that those end points should not have had that much stress on them relative to the other points, in the first place on a recovery.

Unless, the frame ends themselves buckled inboard of the bumper, as in between the bumper, and the frame....

That would let the bumper fold down as described, but wouldn't explain the frame horn ends ripping independantly of other mountig point damage....

Those pics should help a lot...I'm guessing we'll see ripped frame horn ends based upon the above...and slots on the bumper or frame rail where the bumper was attached....and/or, a structural failure of the frame itself, between the bumper and the rest of the frame.

At least it will be interesting from a forensic stand point.