Vader will claim to be afraid of nothing. Fear has long since been driven out of him. It's not true, but he presents it as truth, and even he believes it most of the time. He's certainly not afraid of spirits. He's seen ugly ones. Only ugly ones, really.

He can sense Tech behind him and isn't too surprised - the Clones were (cruelly) deprived of a culture of their own, even if Vader, more than any other, was aware of their creation of one. A larger Clone culture, the culture between batch mates, squads, even those who shared rank, and other groupings. He respected it and allowed it even if under the Empire especially he shouldn't have. His men weren't droids or cogs, no matter the propaganda, and men fought hardest when they were a part of something. Tech being inclined to learn about other cultures frankly made sense.

Even if he did wonder how the man was finding himself, even the annoying lack of technological function. Which was why he was near a rock, balancing his offerings and lantern on the ground as he used the Force to unlatch his helmet and start stripping it off.