Ao contrário da crença popular (bem, Vader), um guerreiro Sith não é imortal. Mesmo que Vader seja poderoso e bem blindado, um ataque frontal a uma base Rebelde seria pouco mais do que suicídio.
Aqui podemos ver meia dúzia de soldados fazendo um trabalho curto com um Cavaleiro Jedi
Há também o fato de que Vader precisa reportar ao Imperador sobre o que aconteceu, bem como planejar seu próximo movimento contra a pessoa no X-Wing
Darth Vader regained control of his damaged TIE fighter. As he headed for the nearest Imperial outpost, he was not preoccupied about how he would explain the loss of the Death Star to the Emperor. Tarkin had been responsible for the space station and its vulnerabilities, and the Rebels had been more cunning than anyone had anticipated. There was really nothing more to say.
But there were plenty of other things to think about. Before Vader had been knocked out of the trench, he’d recognized the Corellian freighter as the same ship that had delivered Ben Kenobi to the Death Star, reportedly from Tatooine. Vader wondered why Kenobi had been on Tatooine, and how long he’d been there. Then Vader thought of the last X-wing pilot in the trench. He was so strong with the Force.
Vader wouldn’t rest until he learned the truth. - Star Wars: A New Hope - Junior Novelization