Exactly. The danger of getting hit with an umbrella is mostly that it hurts. The danger of getting cut with a knife is that you bleed to death. The two are wild

Exactly. The danger of getting hit with an umbrella is mostly that it hurts. The danger of getting cut with a knife is that you bleed to death. The two are wildly mismatched. The likelihood that even a trained combatant would successfully poke out someone's eye before they got stabbed is pretty low. An untrained one will undoubtedly use the umbrella as a shitty club and get stabbed immediately.