This incident was discussed extensively on the amusement safety group. The ride is a cable launched high speed roller coaster. The launch cable failed and either debris or whiplash wire rope caused some major lacerations on the lead car passengers. Besides this version at Knotts', there are similar rides at Great adventure and I believe Hershey and Cedar Point. Given the huge forces involved and the repeated shock loading on the launch cable, this was an accident waiting to happen.