Cullen can sense something of the other man's distress. It doesn't seem logical to him, though, anymore than it was logical to him that he should be so determined for his own Inquisitor to be dead.

And now upset at the prospect that he might be alive?

"Dorian suggested time magic was at work," he finally explains to the woman next to him. "That, being from different timelines, different points in the timeline, the others were all snuffed out."