If the lamps they'd been provided hold true to what they'd been told, then encountering ghosts directly was inevitable. As they continue onward, Tech grows more on the alert. It's like another mission, but rather than being stealthy they were simply expected to pass through an unknown territory, not necessarily enemy, but still very much unwelcoming. Or perhaps that is just how it feels, this tension from knowing you're surrounded. It's difficult for a soldier to be at ease under such circumstances.

Still, the clone doesn't show it, although Vader would certainly sense it, not exactly nervous, but then of all his brothers it would be Tech who remains simultaneously calm. Cautious and still curious. The dead they may be, but they had been alive once, and are still people. The only real concern he has is in the event that these ghosts do prove hostile.

Vader's presence is an odd anathema in some ways, keeping some of the more adventurous spirits at a distance, leaving their stroll through the graveyard unimpeded for a time. Of course such a strong presence also draws like to like, and the Sith lord can sense them, the angry, the distraught. The dangerous.