I like how he tweaked the invisibility formula; it's an interesting take on the concept. This story is fun like that; we're actually examining all the handwaving that goes on in most sci-fi. Pretty cool ^_^
What consequences? That wasn’t sure, but if you mess with time, time has a way of messing back, in unpredictable ways.
Like this?
I don't like handwaving things xD
And yes, exactly like this!