I get that every now and then (all my life) and don't stress over it. If the anus has torn a little during your BM or the actual colon it'll release a little blood but it just means it's a bit irritated. It'll heal. I would be worried if you were excreting a lot of blood, not a drop or two. (It may have also torn a little during your ordeal of contracting the anus while running thru the streets and your body trying to open it up and release it).