I don't really buy the track coming off the loop story but this might sound even weirder. I do believe they felt a jolt and obviosuly looking at the passengers they were slammed forward, and a track coming off of another would most likely knocked the rider upward/downward/backward or something, not forward. So I am kinda leaning towards censor issues in the brakes by the loop. I don't know, my dad kinda knows engineering and he teaches me that stuff and I think I've been working at the park too long.