Darkness and Light: Part 1 - S1-E11
Other mistake: When the Outcasts are launching boulders at the helicopters, they hit one that explodes immediately, and both occupants can be seen emerging from the fireball, safely parachuting to the ground. Even if they were able to jump from the helicopter before it exploded, their proximity to the explosion would have killed them before they had the chance to deploy their parachutes.