Mistress Darcia grabs the slave's long hair and she yanks back his head with such, he almost stumbles backwards. It doesn't help, that Mistress Tatjana lifts her strong leg and kicks him right between the legs. Even though he is kneeling on the floor, he struggles to stay in one place, so the mistresses yell at him constantly, while they turn sides, so both of them can kick them in the balls, hard.