Off screen destroy

Is there a way to turn off the destroy 'off screen'?
I have an actor being shot really high (past the screens top limit) but I don't want to put a block above to bounce it back but it seems that if it's off screen for x seconds then it destroys anyway.
How can I stop this?
I have an actor being shot really high (past the screens top limit) but I don't want to put a block above to bounce it back but it seems that if it's off screen for x seconds then it destroys anyway.
How can I stop this?
Comments
Instead of a wall you can give it a rule :
if self.x is > 900 (or any value you want)
Constrain self.motion.x to 0
Roy.