How would I go about making animated blood

[SilentNight]

How can I make it so when damage is dealt blood flies in the opposite direction from where the damage was done?

[Robin]

Depends if you're using Origins or Stable.

[Tzeny]

The latest version of Origins has this included. You should use it. It's much easier than ES.

[silentdemonic]

You could just Use SetTile for this. If you wanted to be really slick you could grab the layer type and then set it to use the Layer above (could look odd if you next to a building and it splatters in the direction of a fringe roof tile - as the code you would write would have it show on the roof.
But yeah - Eclipse Stable - Set Tile, have it take the current location of the Attacker, The Current Location of the Target, then based on that have it set the tile 1, 2, 3 etc tiles away from the Target.
Depends on the complexity such as decay time before blood disappears or if you want players to clean it etc.