Only if you create a custom decal.
It would have to be an animation of the spark going from the bottom right to the bottom left, and would have to be lined up perfectly. and then you would need to change the normal light of yellow to blue.
I'm not sure how to add in a blue light where the enemy is, unless you had the enemies standing underneath blue dynamic lights that flicked on when the enemy died. You could also change the hit decal from lood to blue puff. I might try this.
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