Das Script müsste etwa so aussehen:

Code: 
Scriptname xxx

ref Ziel
short stage

Begin OnTriggerActor

if ( stage == 0 )
    set stage to 1
    set Ziel to GetActionRef
endif

end

Begin GameMode

if ( stage == 1 )
    set stage to 2
    Ziel.MoveToMarker xxx
endif

if ( stage != 0 )
    set stage to 0
endif

End