AoE **** with Rex Roar

I thought it would be fun to make a simple mod that causes small creatures, players included, to defecate when a player uses the rex roar ability, however I am having trouble figuring out where and how to implement this.

I’ve been digging through the rex files and it seems the roar uses the Rex-Roar-Montage animation. If I were doing this in something like Unity, then I would add a trigger during the roar animation that would call a function that would get a list of creatures within a certain radius of the rex and iterate through them calling their **** functions.

Any tips for how I could do this with the Dev Kit? Thanks.

Edit: It seems P O O P is a no no word on this forum and is filtered out. Kind of funny since it is part of the game, but I imagine the filtering is from Unreal.