I didn't need the dead creatures to remain on the map until the end of the game, and after a large cluster, I simply removed them. This way, the "skirt" wouldn't be so noticeable. Here, I understand the situation is different. It might be possible to try applying StopVisualEffects to a specific point on the map or somehow else. No other methods, without creating a mod, come to mind.

Added 4 minutes later
Although, I just checked, it probably won't be possible to do it that way.

Added 7 minutes later
Here's another possible solution, but it would only work with a mod.

Take some rare, unnecessary object, assign it the model of the desired creature and its arena animations through shared. In this case, there shouldn't be any "skirt."