What skill can I roll to identify the moves the guy used? Martial Lore? Int check?
Do you have ranks in Martial Lore? If so, I'll let you merge that skill with Knowledge (history).
I'd say Knowledge (history) or (local) or (geography) for legends, or for martial arts and combat styles.
Hmm. Maybe a Perform (weapon drill) modified by INT instead of CHA?
Maybe a BAB check? *shrug*
Actually, I like the idea of a "BAB check" modified by INT. In theory, your base attack bonus represents your knowledge and ability to wield weapons (including your fists and improvised weapons) in a *dangerous* way. I think BAB should be worth more than just granting iterative attacks and qualifying for prestige classes (you know, apart from modifying all of your attack rolls ... duuuhh).
How about this:To identify combat styles or martial maneuvers and the like, how about BAB + INT bonus, with a +2 synergy bonus per weapon proficiency? (+2 for martial weapon proficiency, period, with an additional +2 bonus for each exotic weapon proficiency?).