I am not condoning nor favouring the actions of the six engineers, however I do consider their actions as 'going out on a limb'.
So, next time I am in the F/D checking the oxy pressure (as per the transit chk) and I smell an electrical arcing smell and see the window heat light flickering, I would be going out on a limb by investigation the possibility of a loose power terminal connection on the windscreen with a possible cross threaded terminal screw etc. or should I just make sure the F/D door is fully closed behind me when I leave so the smoke does not enter the cabin?