It is was my hope that the Radiant morph for Magelight would work this way, but I think what happens is that the stun might be instantaneous rather than last a second, but you're still stunned.
To experiment, I checked out "Watcher's Hold" in Wrothgar b/c it's full of assassin types. I still had my spell/light/hvy attack interrupted, but could respond faster.
So, it sort of works. Not sure I recommend it for PvE, or how it performs in PvP.