"Wait. Fencing is—" Don't say foreplay, don't say foreplay. "—flirting????" Magnus demands, but he's not so distracted that he forgets to block, which he does by dropping into a low-to-the-ground-crouch, bringing his shield up, so Lancelot will have to adjust; he's banking on the strength in his legs and his general sprightliness to be able to get the upper (lower?) hand.