I do not see why this was closed. I reopened it.
Perhaps technically it was a request for a whole script, but that whole script is just a command, and arguably not even a script.
I even think sparringzone is not a command at all but just some directive for the engine to work differently.
And I think the proper use is this, although I do not remember testing it:
NPC Code:
sparringzone
//#CLIENTSIDE
sparringzone
I think the server needs to know about the sparringzoniness of the level as well.