Like I said, I'm lazy. :P

I use Betty and Cuterie as tokens to deal with the tengu, so Berna gets deployed for that reason.

And Berna does fine against Ushi-Oni if one of those things isn't true. I just had a run where all three of those conditions happened, and it quickly fell apart. Elizabeth had no choice but to spend more time focusing on finishing off the Ushi-Oni, so Nurarihyon managed to start moving, etc. etc.