You dont have the right to alter other scripts, thats the reason the & option exists, to allow you to halt YOUR script if it should not act if someone elses has already halted the event.
The other script might be a KICK logger, this would not want to be stoped just becuase your script ran.
The seemingly mass failure of scriptors to add the & option to events that should not trigger if there already halted is wide spread, i know i never used to have it.
I would hazzard a guess you have not considered adding the & to your script either, even tho it most definitly should have it, why would you need to conditionally halt if the events already been halted?
