So... fair is foul and foul is fair...

I definitely pictured the witches differently, sort of like the young-looking one only with scraggly pirate beards.  I also kind of thought their unison would have been more in unison, instead of the higher voice lagging half a beat behind, but I really hadn't thought about what they were doing.  I sort of imagined them wondering across the stage and just randomly talking to each other, then just arranging another meeting place.  I obviously don't use my imagination very much when I'm reading...