What I understood in episode three was that Makina got afflicted with a curse to which takes advantage of her depression over Keisei's loss.
It's starting to get on my nerves Makina's inability to carry on and just continue sobbing for Keisei, just as Ouri's ineptitude to reap a decent growth as a monk trainee.
Anyways, Makina faces-off her alterego, which tempts her to cast away her memories for Keisei and sever all her ties in the living world if wants to carry out her vengeance.
The curse takes full possession of Makina, and she becomes a soulless bitch, and there she goes with berserk power and monstruous stamina towards her primary target....
....which, of course, is Ouri, demanding a favor from the lad to step down on the contract, because, as she puts it, he's a nuisance and doesn't have any speck of power to contribute in her fight, all while she stands on top of him, who is naked, with tattered and torn clothes which barely cover her whole body but no panties.
Naturally, Ouri refuses which leaves Makina with no choice but attempting to deliver a killer chop down his face at point-blank range.
Mostly for the disgrace of the Ouri-haters audience, Rika makes it in time to wrap and confine Makina's killing arm with her strings, thus, saving Ouri's life for the time being.
Then in a shameless and blatantly obvious pun to Yu-Gi-Oh! references at least to me looked like
, Rika goes to explain in speech speed the spell she casted on Makina along with the effects. This buys enough time for chibi-Saki to burst out in a surprise attack and pin down unconscious a distracted Makina with her hammer.