He's an obsevant man and has indeed taken mental note of what was bothering Ren. From the internal conflict and the reduced use of that one arm. But he said nothing of it for now. Instead, the Jedi simply nodded and went to go make that tea.

It would take a few minutes, but he would soon return with a pair of steaming cups. Offering one to Ren on the side where his good arm could better reach it. Once he took it, Obi-Wan would settle himself down into the chair again.

"Chamomile. I've heard this herb is good for relaxation."