How many times does this have to happen? It's totally preventable and just makes my heart hurt.
Where was the fight choreographer? Where was the SM? Where was the props master? Why didn't the actor(s) object?
ETA: We're dealing with this in my show right now- no combat, but a lot of "cooking" onstage, in full view of the audience, with dialog about the specific food items being chopped. The knives have to be sharp enough to cut a carrot and some scallions, but dull enough that we're not as concerned with actor injury. Our props master tested various levels of sharpness before we found the right balance.