Luke senses his presence in the Force

Suddenly his hand opened as if he'd been shot. The pink bulb fell to the ground as Luke stood bolt
upright, eyes open and staring. The Princess rose, tried to make something of the gaping expression on
his face.

"Luke... what's wrong?" He took a couple of unsteady steps.

"Was it the fruit, boy?" Halla looked equally concerned. "Boy?"

Luke blinked, turned slowly to face them all. "What?"

"We were worried, Master Luke. You..." But Threepio broke off as Luke turned away to stare
eastward.

"He's coming," he murmured, every letter resounding. "He's near, very near."

"Luke boy, you'd better start making some sense or I'll have Hin hold you down and feed you dipills,"
Halla said. "Who's coming?"

"There was a stirring," Luke whispered by way of reply. "A profound disturbance in the Force. I've felt
it before, weakly. I felt it most strongly when Ben Kenobi was killed."

Leia inhaled in terror, her eyes widening. "No, not him again, not here."

"Something blacker than night stirs the Force, Leia," Luke told her. "This Governor Essada must have
contacted him, sent him here. He'd be especially interested in locating you and me.

Splinter of the Mind's Eye 102