John Riggs wrote:
... If someone slips or the knife falls out and someone falls on it serious injury could occur. ... A real attach with a live blade and the defender has a momentary brain freeze and someone could be badly injured or killed.
These are very real risks in the dojo when live blades are used. With the current situation with public liability insurance and the need to maintain a duty of care, the use of live blades is something for very careful consideration.