Isn't that just frametraps? In fact, my light will beat your medium if we press it at the same time.It does, and it's a system that was in 3rd Strike.
Yes, I assumed it was clear but just in case, both have to hit at the same time for the normal system to take effect. light attacks can still beat out attacks that haven't come out yet.
edit: Guess I was wrong!? Weeeeird. Thanks for the info!