Sasha is unconscious in the chair.
Becca ties one of her arms down, but Sasha starts to come to before Becca can get the other one tied.
So, Becca chloroforms Sasha!
When Sasha comes to, Becca enters with a whip, and then chokes Sasha out with it.
Becca chokes Sasha out again when she comes to, then, when Sasha wakes up again, she knocks her out by covering Sasha's mouth with her gloved hand.
Sasha comes around again, but Becca chokes her (and covers her mouth) with her gloved hands, then returns with some rope and chokes her out once more.