It could be that it might be written ambiguously. English is my second language.
You are correct, it means when attacking with multiple dice due to bane.
I appreciate the questions.
First, thank you!
Second:
If you would attack with three dice, maybe because the character is "strong" and a "swordmaster", and then you get a bane, perhaps attacking through a curtain, you would roll 2d10 and use every roll that exceeds or meets the TN of the opponent.
I hope this helps. 🙂