Your supernova is designed that way?
that seems a bit odd, if its blowing back as it recoils isn't it risking some of that pressure coming out the side of the gun? (especially if the shell, no longer contained by the chamber, breaches)
All slides (that I know of)
"unlock" allowing the user to shackle in another round without having to manually hit the slide release, but to actually move...I would think there is a mechanism that should prevent that happening until after the full discharge has occured and the user intends the action to move.