
That screenshot is of me getting a face-full of fireballs from Korax. However, notice all the dark spots on the ground? Those are flat-shaped models used to make blood splats on the ground that were generated when shooting Korax. For some reason, the models show through the fireballs more than the surrounding ground does. In case it is relevant, the blood actor is set to be slightly translucent too. The trees are also models and do not seem to show this effect.
If you need a test file I can make one up with a bit of time but I figured that you might know what is going on without it.