The team created a plan, and everyone assumed their positions. Having more people in a team was advantageous when digging into a large Planet.
Sebastian was stationed pretty far up in the hole. If the Planet shifted and the walls above him broke, he would still be powerful enough to deal with the avalanche. This seemed like an unimportant job, but it definitely wasn't.
If a cave-in happened far up, the debris would have a lot of time to accelerate. Intense gravity increased the speed of acceleration of a falling object. If some heavy stones had millions of kilometers to gain speed, they would reach a terrifying level of speed. Getting hit by such a fast object could prove deadly. Even more, if the falling debris hit the walls on the way down, it could destroy the Formation Arrays, leading to a second cave-in.
