Personally, I'm surprised more of these types of accidents don't happen. Its often that I see directional pieces placed that, if they were to fail, would cause a significant fall to be experienced by the second. Even toproping, I see people place single pieces as directionals that could cause in excess of 15 or 20 feet of rope to enter the system if the piece were to pull. A groundfall from 15 or 20ft is absolutely unacceptable, especially when people are climbing under the assumption that they are protected by a toprope.