Obi had sensed a darker presence lately- the Force was pulling at him strongly, and he had his suspicion as to who it might be...but he'd kept quiet for now. Instead, he was biding his time and watching, but as part of his precautions, he had started patrolling. And that was what he was doing that night, dawned in his old robes he was quietly watching the streets when something....dark approached. Powerful. And as it came closer, he reached for his own weapon and turned.
His blade ignited just as the other man's did and he glared. A Sith. Here? Obi held his ground, breathing slowly. "I haven't done anything, nor did I bring you here. Stand down and I can explain." He kept his words even, his eyes studying this man.
Boy.
No. He did not know who this was, but he could not risk showing weakness. Whoever it was, the boy was strong with the Force. Stronger than Leia and even stronger than Luke. He'd be a threat until he would back down.