FataLisT, have you tried placing the combat script in the root directory of the map? It works for me that way, but I don't remember why it was done like that.
Essentially, it doesn't work in this form. I tried enclosing the path in both " and ' quotes. It still won't access the combat script. Again, when I replaced MapScript with DragonCombat, the *.lua script ran from the script when launching the map. The connection within it is properly defined, so that seems to be the issue).
I've attached the current version of the map just in case. Maybe I missed something in the additional settings. At first glance, everything is set up the same way as in other messages I found here.