You should do some tests with the particle effect of Construct 2 and a physic behavior, I don't know if we can combine these two. Otherwise, maybe just the particle effect or just the physic behavior. Basically, when something is death, it has to spawn numerous little red sprites around, which will fall to ground. I'll see tomorrow and make a CapX if I get something interesting.
You should maybe take a look at that : https://www.scirra.com/forum/blood-splatter_t78354
The examples aren't available anymore but they are still some informations there.
And make some researches too, once again, this forum is full of informations for everything.