Hmmm…
Crawl
Pan down to establishing shot of TIEs flying over Mustafar
Cut to interior of Star Destroyer, as Vader’s helmet emerges and Kylo places his hand on it. Maybe Vader says something vaguely relevant or just the vision that was there originally. Kylo begins to walk off.
This makes even more sense considering that he’s about to pay a visit to his grandfather’s castle. Of course he’d commune with the mask.