That just shows you anything is possible. I had a taxidermist once that showed me a perfect 3-bladed scar on the inside of the neck skin on a buck he was mounting.

You may have gotten one lung on this guy, especially since he bled for 1000 yds. I've seen that happen before on a doe I one-lunged. She dripped about every 15 ft for 3/4 of a mile and I never found her. There was good blood at first, so I assumed she was dead but I think I pushed her.