The Imperial shuttle was just clear of the landing bay when Vader saw the two rebel ships from his seat behind his shuttle pilots. They had clearly changed course and were trying to blast their way out of the blockade. He also saw the head destroyer closing in. They would be in tractor beams in a matter of moments. He ordered his pilot to get the ship's commander on the radio. He was about to order them placed into the larger and more secure admiral ship.
He stopped when he noticed that instead of tractor beams, there were huge laser blasts emanating from the underside of the monstrous destroyer. The cannons showered the two rebel ships with a curtain of energy. There were massive explosions and then the two were gone. From what Vader could see they were completely obliterated without a trace. But Vader knew his eyes had deceived him, the force told him otherwise.
"Commander Vinn," Vader coolly spoke into the radio. "Track the last know trajectory of those ships."
"Lord Vader, I regret, uh- that is, it is our belief that they were destroyed," the commander stammered, "I'm afraid there was some miscommunication on the lower decks. There is nothing left of them, sir. "
"They jumped into hyperspace, commander- both of them. You will be able to track the Millennium Falcon from a tracing signal. Start that immediately, then meet me on the Admiral's ship and we will discuss your failures in person."
"Yes, Lord Vader," answered the commander in a distant tone.
Vader would now have to tell the Emperor of this failure as well. It was obvious Vader would have to take a direct role in command of the military. This further backed his push for a large enough command ship to crush the remaining rebel sympathizers and restore order. It would not be difficult. In many ways the destruction of the Death Star cleared obstacles to Vader, including Tarkin. All ironically due to one rebel pilot.
The admiral's flagship approached as Vader pondered about that pilot who wielded the force. He was reckless, undisciplined, definitely not Jedi. Vadar had no sense that the rebel had detected him and his own command of the dark side. Still, even though his abilities were raw, there was great power in him. And what of his connection with that Corellian ship. The Millennium Falcon carried Obi-Wan, and perhaps the pilot as well. Was it Kenobi's apprentice? Possibly one who's training was cut short by Vader himself. This pleased him greatly as he calculated his next moves. His regulator sounded deep breaths as he sat in thought.