In a sense, my experience was also run-flat bloodless. It hurt like hell, and I hobbled instead of running. But when I took off my sneaker, there was no blood AT ALL. On closer inspection, A PLUG OF RUBBER from the sneaker sole was in the hole!!!
I went to the doctor to have it looked at. He pulled out the plug and it bled like crazy! And of course, the Auslander's above mentioned tetanus shot was required.