It's not, actually -- what Magnus is doing to indicate time is so abstracted from what Galahad would think that he doesn't make the connection at all -- but he gets the gist that Magnus likes this.

"We can talk any time, too. I like talking with you, and I like-- listening to you," he says. He's so at ease. It's so easy to talk to Magnus: his words still get trapped inside him, but less often, and he feels less the dread of needing to make sure everything comes out right, and because he feels that dread less he can say more. He taps his fingers against his wrist. "What does this mean?"