Yussa looks back at Caleb again. It isn't the apology that strikes him, but something else in his tone. He studies the younger man for a moment before he continues. No way to investigate beyond observation, after all.

"Naturally," he says lightly. Of course Caleb would be curious - he's an inquisitive person, and it is a trait that Yussa both admires and finds endearing.

"Ryn and I travelled frequently together for a while. I was interested in their experiments and exploration. They study arcane ley lines and planar travel. The space you found in the Fire Plane is one of many."

Yussa allows a fondness in his voice as he speaks. It is real, after all, though he and Ryn have not been traveling companions in some time.