请问老师：

He told everybody he was going to demonstrate a disarming technique: how to twist the enemy's blade with the flat of your own sword so that he had no choice but to drop his weapon.

"This is difficult," he stressed. "I've had it used against me. No laughing at Percy, now. Most swordsmen have to work years to master this technique."

黑体部分怎么翻译？

官方翻译是：

卢克告诉大家，他将要演示一个解除敌人武装的技巧：如何用你自己剑身的钝面扭转敌人剑刃的方向，让他毫无选择只能缴械投降。

“这很困难，”他强调说，“我要波西用这个招式来和我对打。现在大家不要嘲笑波西。绝大多数剑客都要花上好多年才能练成这招。”