Thanks Everyone!
I didn't realize there was a capture nut to deal with. I dug through the layer of dirt/oil and found the nut. The nut wasn't turning so I pushed down on the bolt while pulling on the skid plate and presto! The bolt looks like it was a replacement bolt and stripped out faster than the rest of the bolts. Either way, I am replacing all four. BTW, it was a bolt on the crossmember.
My car deserves better than me
Cheers,
Derek Basch