I read somewhere that an arrow to the thigh can kill someone. Is that true? How?

If it severs the femoral artery? That can kill in minutes. Combine that with the fact that arrows excel at cutting tissue apart, and the risk of severing something important is pretty good.

Even if it misses anything major; you’re still pumping a lot of blood through your legs, so without medical attention, bleeding to death is still a real possibility, even if the arrow doesn’t hit anything vital.

-Starke