Keybinds Making Entities do Things

Hi! In my mod, I have 2 keybinds that are intended to be ability activators. The idea is that, assuming you have a tamed mob in the immediate area, this mob (or mobs) would activate an ability that affects the user. However, I can't seem to get the procedure to use the mobs it finds as the basis for the rest of the procedure. Is there any way I can fix this? I've switched all of the "Entity Iterators" with "Target Entity" and using "Source Entity" makes it to where I can't pair it with the keybind.

Is this possible with a keybind, or would I have to change my method in a way that makes it to where the keybind can't be altered?

https://imgur.com/gallery/4zYayzA