Episode 15 was absolutely a fantastic way of ending the arc. Revy was definitely smart on not going against Hotel Moscow, haha. Man, she and Eda would've been so screwed if they continued ^^ Balalaika kicks so much ass, haha.
To be honest, I didn't expect the last twin to actually die at the end. However, it was a great way of showing some of HM's power.
Bring on the next arc!