Unfortunately, something has disrupted the signal. It may be the exploding bulb from inside the cave, the cold and altitude from the mountains, or a combination. However, this doesn't mean the tracker is useless. Should the Search Team come fairly close, approximately a 1 mile radius, they will be able to catch a signal to help them locate the individuals towards a precise location.

The whereabouts of the Acolyte is on the mountains, though the tracker will experience the same interference. Similar to above, once the receiver is within a 1 mile radius it'll point towards what appears to be a few Abraxan natives, either with some of the Summoned or by themselves. If the characters approaching this group are unaware that one of the trackers was planted on an Acolyte or they are not carrying a receiver at the time, they may not realize the truth, which is that one of the Acolytes is hiding among the survivors.

As well, it is possible for the receiver to catch the signal once everyone has returned to Nocwich should Viktor or another character happen to be holding it. The tracker can be discovered on the mountain, afterwards when the native NPCs are rescued and returned to Nocwich, or simply never. This will depend on what characters choose to do and how suspicious they are of the circumstances.

You can coordinate with other players and use this information to determine how you'd like things to unfold.