The fire scene needs edited. take away Vader holding up his arm to block the fire. Vader is not bothered by fire. And let the Loader droid IMMEDIATELY enter the scene to grab OB1. This scene is drawn out way too long.
Do we know that since he may have ptsd from being burned?
In the comics, he walks through fire, lava, and more. His suit protects him from all of it. Vader would NOT be afraid of fire. He even built his castle on Mustufar.