[@McHaggis]
There's a fairly awful series of fantasy books that start with Eragon where they have mind battles and the idea is that to defend yourself, you have to present a potential invader with a solid wall of something. A thought, a memory, something that you focus your conscious thought on so they can only see that. People who are serious about it in the books learned how to put up a wall by mentally reciting a poem or replaying a memory even while they were fighting or talking or whatever. As much as I thought the books were derivative and terrible (I still read all four of them, two of which were near 1000 pages), I did like bits of the magic system and that was one of them. Something similar is mentioned the second Knights of the Old Republic game.

It's basically what Andy will try if/when he works out what Jay is doing; feeding him mental static by mentally singing a song to shield his thoughts.