It seems like a glorious victory, but let's look at the aftermath a second.
Reimu and Meiling - full life, in range of units 12 and 17. If both attack the same target, they'll do 14 to Meiling or 12 to Reimu. Not that bad, right?
But...
Sanae - has taken 5 damage from attacking. In range of units 12, 19, and 21. 8 damage from 19. 6 damage from 21. 2 HP remains. If 12 also decides to attack me instead of the other two, I'm dead. If not, I'm still completely useless for the next turn along with whoever got tagged by 12. Which is not a good situation for being able to deal with the next turn.
Upon further consideration, namely me forgetting before about 17 being in range of J11, I withdraw the plan to wall there. We could cobble up something at IJ10 and H11, but I don't know how well that would work out. Or we could always retreat or attack. I'm dead for ideas right now. Do with me as you will.