mmmm..I havent Tested that Functionality for Particles.
It probably is possible..
Particles are great BUT They have limited control once they are Spawned..its just how particles function..They arent designed with overly complex motion..its why they are quick and easy to use..
About the only thing I could suggest would be to use a different Idea
It may be Quicker to use another Sprite of a bunch of blood particles like a "splatt" and assign a Bullet Behaviour to it..
The reason being that YOu will have far greater control over the 'particle' and can even have gravity, reverse motion or bouncing effects
and then spawn a few of them as many as you need and control each Blood 'particle ' via your script using the "on created" condition...
I have had to use this idea in some of my projects ..where the Particle Plugin just doesnt do what I want it to..
Particles are usually what you would use but I Think the behaviours you are after are a little out of its design features..No fault of the Plugin ..just its not designed that way
:) hope that helps