1. Tsurugi tells Rika a plan that makes her thing Tsurugi is rotten to the core
2. They bring out the SSK and she tells him to focus on swinging while she puts power behind his attack
3. Maru turns around cause he sensed the curses and Rika with a free opening sits there
4. Maru still looking away tries to tell the curses to stop and Rika prepares or starts to swing the sword (speed-lines implying motion)
5. After the explosion and Maru being clearly stunned Rika is still
standing despite getting ready to swing the blade 2 pages prior but now she's back to sitting in place there until the last second
6. After all that sitting there and apparently charging so Rika can put energy behind his attack all they could deliver was a shallow cut.
Rika and Tsurugi recreationally sitting in the corner for 5 minutes as Maru screeches at curses with his back turned, only for them to prepare to swing their sword and go like "actually nah let's not do that" wait for Maru to get the recoil from the curses and then
turn BACK AROUND to face them only to deliver a shallow cut doesn't work for me.