My take on it is that Suiko would gladly fight Suiryu since she believes she's stronger than him since she doesn't slack off, if only to prove that thought.
Like seriously, the past few chapters never even happened in the original novel. The author just had Kearu knocked out, with no stupid fight scene in between and an extra old man from who knows where, before cutting to the end of this chapter.
It's 3am in the morning and here I am, trying not wake up the neighbors, when I read this chapter.
I'm literally dying to preserve peace and quiet right now.