Mithias gasped as the ship's movements became erratic. He wasn't buckled in and so got knocked off his feet and/or thrown "upward" as the ship began to accelerate down to the planet. While Sebastian was trying to attack whatever might be in contact with their ship, Mithias began to focus any and all of his telekinesis onto the very frame of the ship itself to slow it down. It was a big ship and took all of his concentration, but it did slow and at least some semblance of gravity was able to be felt again by the ship occupants. As far as heat and fire, he could turn to that once the ship wasn't careening to obliteration. 

"Sebastian! What in the living hell is going on? Why do I have voices in my head... in *MY* head for God Emperor's sake?!"