"Flickering Flame Skirmisher" Hiruma Scout School ability (L5R CR, p. 58) says this: After performing an Attack action, you may change your stance. If you do, increase the TN of Attack checks by creatures of silhouette 3 or larger targeting you by your school rank until the start of your next turn.
As I understand, "After performing an Attack action, you may change your stance" can be used against any opponent, regardless of silhouette. Big creatures only subject to what goes next after this. Is it correct?