Soul Nomad (Prinny Presents Vol. 1) questions on gameplay

[LeatherRebel5150 | 1,056]

May be a bit obscure but hopefully someone else here has played this. Im having a hard time figuring out some of the mechanics of this game and wondering if someone could help me out. Does anyone know how to fight the merchants when you fill up the yellow gauge? I can’t figure it out and the only answer Ive been able to find is for a different version of the game and doesn’t seem to work on the Switch version.

[Tabonga | 2,317]

I have it but have not had a chance to get to it.

No idea if this is reliable but you can try this:

I had a question about Langrisser and I contacted NIS America via customer service - they referred it to another department but they did eventually get back to me with an answer.  So that is a route also.