There's a flaw in your plan, Nanase: Grace has no idea how to swiftly and safely knock someone out and will probably never ever learn how to.
Also, Vlad is REALLY LOUD OMG
In case you're wondering, that "snap" sound was literally Vlad unhinging his jaw like a snake.
I'm not actually sure that would normally make a snapping noise (do snakes snap? I sorta doubt it), but Vlad made it happen in such a way that it might have been similar to cracking one's knuckles.