Youmu attacks: fighter at 5 HP, no good for you, and if she doubles, dead fighter, no good for you.
Meiling attacks: dead fighter, no good for you.
I attack: fighter at 4 HP, but then Meiling and Youmu have to deal with the merc, and if Meiling misses, the merc can kill me, you, or Byakuren.
This is a bit more complex situation than I thought. I strongly believe we should outright kill both units this turn. I'd suggest taking an ineffectual potshot at the fighter before Trance takes his head off, but Trance is on the godsdamned space you'd use for it. Ugh.