Caliban tried to listen to their hushed conversation, hearing something about being followed. He sensed once more but found no other mutant presences close by but their own. He was still a bit suspicious of their reasons for seeking him out.
Occasionally, someone came to Caliban seeking to use his powers to track down or hunt down another mutant. He could do this easily if they were in range of his power, with more difficulty if beyond it. Perhaps that is what brought them here. If so he could perhaps negotiate for supplies.
Weary, he stayed in his position above Logan in the pipes and scaffolding of the sewer. "Friend Logan, you need Caliban to hunt someone down?"