Oh. That wasn't an answer he was expecting, and it tripped him up - made him pause a moment too long as his thoughts wound around that, reassessed what he'd been told in light of that, made him slow to react to Nash's riposte. There's the suggestion of a parry in how Oz's blade started to move, but it struck nothing but air, while Nash's strike landed.

This would be where a third party would call the touch (and if it were valid or not), but Oz paused in acknowledgment anyway, huffing out a laugh after a bare beat.

"Your point! It seems I'm even rustier than I thought."

Or more easily distracted, anyway, which was a more chronic failing.