Here is the way I read this. You guys were still in negotiations and had no sealed deal. the_end made stipulations to the deal that the other upper be shipped first and bushmaster1 did not agree and pulled out before the deal was sealed.
If bushmaster1 had said "Ok, I will ship first so you can inpect" and agreed to the stipulation on the deal then it would of been backing out of a deal, but there was no deal here.
Nothing lost but a bit of time.