"Vader," the Emperor said, without preamble. "Explain yourself."
Vader looked up from where he was undergoing what was either maintenance or surgery, depending on your perspective.
"Master," he replied, facing the hologram.
"Where is my Death Star?" the Emperor asked.
"Exploded," Vader told him. "In addition, Master, I wish to inform you that I will be taking leave to rethink my life."
The Emperor stared at him, somewhat thrown.
"What?" he asked.
"Consider the following, Master," Vader replied. "I went back over security footage and similar, to understand what had happened, before the security footage exploded along with the cameras and so on; subsequently, I have obtained certain information about the Rebel who destroyed the Death Star."
He frowned. "Is this really the best repair droid you have? I could build a better one than this in my sleep."
"Vader!" the Emperor snapped at him. "Get to the point!"
"Shortly after the destruction of Alderaan, a YT-1300 freighter arrived in the system," Vader said. "A perfectly normal low-rate cargo freighter of the sort normally flown by owner-operators. On that ship there were the following individuals. Firstly, my astromech droid."
The Emperor was about to reply sharply, then stopped.
"What?" he asked.
"Secondly, a wookiee," Vader continued. "Specifically, the one who saved Ahsoka's life. Thirdly, the protocol droid I built as a child. Fourthly, my son. Fifthly, Obi-Wan Kenobi, back from the dead, and I am honestly not sure if he can do that again. That ship subsequently escaped with the Princess aboard, but I am not counting her. The final person aboard was a human wearing a vest, who I have not been able to identify."
"...this isn't actually answering my question," the Emperor pointed out, snippily.
"My son was the one who destroyed the Death Star," Vader provided. "But I want to point out that during the battle over the Death Star, which was of course before I learned that the rebel X-Wing pilot was my son, I was about to shoot him down, until I was ambushed and fired upon by that same YT-1300."
Vader folded his arms, which dragged the droid working on his left one across the room. "I am going to be taking leave to rethink my life, because I am reasonably sure that the human in the vest was the personification of the Force, a thing which I am quite sure is possible though I am not able to identify why."
The Emperor just stared down the holonet projection for a long moment.
"And what do you think this personification of the Force was trying to do?" he asked.
Vader shrugged.
"That is part of why I intend to meditate," he said. "Though, Master, I should warn you to watch out for YT-1300 freighters. They are more dangerous than they seem."
AN:
It's not a fundamentally unreasonable conclusion.