Ah, well, that could explain the twitchy reactions. He.. should try to remember that, that not everyone is used to healing magic, which honestly feels like the one that most people should be familiar with to him.

"... Study, an application of math to guide the particles that make it work, provided you have enough of it about to pull it off, and a casting aid." Duke's short answer is pretty clearly the explanation of how all his magic works. "Healing magic is a little more and a little less complicated - more variables and ranges involved."