It's a funny thing. Fall victim to a betrayal by your own men, ally yourself with the enemies of a powerful ruler, and then find out that if the truth of your parentage had been known, you yourself would have been the biggest target in all the seven kingdoms, and you start to feel like you're always being watched. So when Jon pays the vendor, picks up his new pair of boots, and turns to discover that there actually is someone watching him, he's not surprised.

"Can I help you?"