I'm not sure about JP, but at Spiderman Im fairly certain that you must exit the car and reload through the baby swap line. Ride throughs from unload to load are generally not allowed. It's a thing about the black hole, like the Bermuda triangle. You might not come out the other end. It happens, honestly, it just doesn't make the news. I mean, whole families have dissappeared. Those just no logical explanation. It's a theme park curse sort of theme. I think it started at Haunted Mansion at WDW some 15 years ago.