I'm not sure if you meant to attach a screenshot, but I'd be happy to help clarify a script if you're having troubles. I mentioned in another comment here that there is in-game documentation that you can find from the ❔ button in the script editor. It says this about "willMissilesHit":
Also, I don't know if you watched the video that pops up when you first go to the script editor, but it could shed some light on terminators and the "exists" block:I'd love for there to be better content for teaching this directly in the game (as opposed to on YouTube). It's on the roadmap, but I don't know when it will actually be in the game. My guess is that it probably wouldn't be before mid-2020 (if Bot Land is still in development then).