Had a helper that did this, or close enough to it. The blade belt broke and I watched him for 5 minutes run the mower, inspect the grass behind him and then ... run the mower again. He never inspected the mower or came to me and said he had a problem. He just kept mowing, inspecting, and mowing some more. It was a good bit of comedy but the understanding that it wasn't a performance limited my ability to enjoy it.