I can't imagine the battle being really all that great, if they'd be likely arguing the entire time. We still don't know the tone of this particular episode. But given TR is involved in this episode, I can't really see a hypothetical battle this episode might bring being anything but comical lol.
I don't think we are discussing a particular episode. Ash vs Iris is being speculated from the DA poster showing them glaring at each other. That's all we are going on at the moment, IIRC.