I've got a player who's a Hida Defender, and looking at taking Rushing Avalanche Style, because duh.
But she's raised a question, regarding the second Opportunity spend; it increases the damage on targets that are Prone, but the only obvious ways to knock people Prone are via Techniques.
Is there a general 'You can spend X Opportunities in Y stance to attempt to knock someone Prone' that I'm just overlooking?