Murasa said: Don't make me captain of a ship that I don't know how to run. Especially the exploding ones.
...Is what I think she's saying here. And seeing as how Byakuren can't use her usual power (as quoted by herself) Murasa is having fun in getting 'revenge.'
Splash!Ah... Murasa!Splash!Splash!It's cold!#100 Hijirin's HardshipThank goodness!
You're alive...Splash!If I could use my usual power...
This water would be nothing...!
...How mortifying...!!Ba-thump!Ba-thump!
Ba-thump!Splash!...What, kya!?Wait, Murasa...Splash!