[Diarmuid gives his brother another proud look, glad to see the boy is finally realizing that defense is just as important--if not more so--than attack.]

Defensive moves are best shown when someone is actually attacking you. It can be hard to see exactly how things flow otherwise.

[He readies his swords and then beckons to his brother.]

Attack me, but try to watch what I do when I block the attack, okay? Don't really worry about trying to get passed my guard.