I think Khev posts over at Bluray.com also
"When Vader chucks the Emperor down the Death Star shaft, I can TOTALLY imagine that the swirling maelstrom of blue fire is a gateway to Exegol, which the Emperor is creating with his Sith powers as he falls. It's not even a stretch for me, quite frankly. To my eyes, it never looked like "an explosion"; there was always something supernatural goin' on there."
"When Vader chucks the Emperor down the Death Star shaft, I can TOTALLY imagine that the swirling maelstrom of blue fire is a gateway to Exegol, which the Emperor is creating with his Sith powers as he falls. It's not even a stretch for me, quite frankly. To my eyes, it never looked like "an explosion"; there was always something supernatural goin' on there."