Well was there a cut there, maybe you were sleep walking on this guy before you left and thought you had done the deed, gathering from the memory of the process thought there was blood draining. I don't know, could happen right!Which way are you leaning?
It was certainly a first for me.
It definitely wasn't Kosher.
A friend told me about a huge slaughter and after they threw all the roosters into a pile to be processed when they were done. After a while, one got up and ran away. He was kept to be a breeder for his will to live.
Oh you mentioned about Lactic Acid settling in his system before processing, what happens if the lactic acid remains, does it give the meat a different flavor?