Part of my strength as an actor comes from what I've learned all these years: when you play a villain you try to get the light touches when you play a hero you try to get in some of the warts.
You can manage 50 people through the strength of your personality and lack of sleep. You can touch them all in a week and make sure they're all pointed in the right direction.
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This is just what I have thought when I have seen slaves at work – they seem to go through the motions of labor without putting strength into them. They keep their powers in reserve for their own use at night perhaps.