Trying to identify a bug that left a blood spot when killed
That looks like a species of syrphid fly (aka. hover fly, flower fly) — not sure about the red fluid, but it probably wasn't blood.  These flies are pollinators and the larvae eat pests such as aphids.

I don't know for sure what species that is, but it appears very similar to Toxomerus politus:


Other sources of information on this group of flies:


http://thingsupclose.com/syrphidae-hoverflies/
http://bugoftheweek.com/blog/2017/10/31/flies-that-mimic-wasps-masquerading-syrphid-fly-ihelophilusi-sp
http://bugoftheweek.com/blog/2016/10/19/a-flower-fly-grows-in-brooklyn-flowers-flies-syrphidae