In my WIP (well...its on hiatus for now, but that's a different story), my MC is fighting this assassin whose main ability is super speed. The MC figures the only way to beat this guy is to damage his legs, so he manages to stab the assassin in the knee with a hidden dagger. How much would that wound affect the assassin's speed? Just for reference the assassin's speed without the wound is supersonic (assisted by magic of course). So with the wound how much would he slow down by do you guys think?