ride. it was filled with people and it slammed into a tree and went off the tracks. how does that happen? heather childers has more on the frantic effort to save almost two dozen people who were stranded up there on the coaster. >> how does it happen and what does that feel like? sunday at a california amusement park turns into a nightmare as a roller coaster heading 55 miles an hour aun a corner smashes into a huge tree branch that apparently had fallen on to the tracks and then derails. 22 terrified riders on the ninja coaster at six flags magic mountain were left dangling 30 feet in the air for nearly three hours as day turned into night. >> it comes around, hits the tree. the fire department had a chain from the cart to the track for precaution. >> you can see fire fighters bringing the trapped wrierdz down one