That’s the thing though, I don’t think it is breaking any Creo rules. It is making water at a target’s location, which is allowed in general, and is not prohibited specifically by anything written in any of the books.
I checked the thread which I remembered having this pop up for Definitive Edition and David Chart’s final choice was “leave it up to troupe decision” as to whether you could do these things because it would require a lot of clarifying and didn’t seem to be a problem.