The pig is a fucking moron if he think akiba won't throw the match even if Adachi does what he says. The guy has never shown any form of mercy to his victims, why would he start now? It's far less risky to take the fight on two on three. (I read ahead and see that Adachi survives which I have to wonder fucking why)
Adachi also should have kept items with her after knowing about the ability to carry them over, especially ranged items like a bomb like the one akiba used to blow her enemies in one fell swoop given how she's a melee character. It could also be used as a gap closer akiba wouldn't be able to predict, similar to snake's grenade. Or kept the berzerk item like that kid did as a last resort, because that would finish off her enemies immediately. But of course, that would give her chances to fight back which has been established to be illegal so there is that.