As I was walking back to look for something else to try to get it out of the dumpster with, like a blanket so he could get some traction instead of that piece of drywall, he climbed up to the top corner and jumped out and pretty much nose dived right into this little block ledge at the base of the dumpster, I was like 10 feet away and I thought he knocked himself out, it looked bad, it was probably 5 1/2 feet from the hard ground, but he seemed fine. He walked toward my neighbors complex and got some water from a puddle that had collected on the ground then just left, that was the last I saw of him. He didn't have a collar and was dirty as fuck, so I assumed it was a stray, which was also why I was a little concerned with rabies