Well thats right of course, I was wondering if he was looking at blood clots or if he was just making it up entirely. I hadn't been in a dusty or dirty environment where I would have inhaled anything prior to the injury, after the injury I couldn't even breathe through my nose and it bleed pretty heavily. By the time I ran through this roadblock however I'm sure my sinuses were full of blood and mucus which may have looked similar to residue.. anyway I had a CT scan done at the hospital that showed sinuses full of blood and blocked off.