flies dont have red blood...

that's a mosquito

mosquitos are from the same genus as flies

But they’re still different insects

and pretty much all insects have the same type of blood (it's not really blood, it's a green substance like blood), like how mammals all have red blood

The human blood inside of it duh

Big brain

That's not his blood, that's the blood he drank from the human

Ohhh

Big brain

finally, the fly is gone