A Modest Proposal:
Do some thoughtful noding -- something that calls for extra effort in thought, research, exploring all sides of an issue -- and dedicate it to sensei's health.
In Jewish history, when a great rabbi (rabbi = teacher = sensei) had fallen ill, it was customary for his students to offer a few weeks or months from their own lifespans in order to extend the rabbi's life.
Would you do so? Then node with great care, great love, and great dedication, because you will be noding for sensei until he can do so himself.
To sensei's health!