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Part of a new scene written for the show which we’ve glimpsed before of Jon Snow and Ser Jaime interacting. There’s certain parallels between these two characters in the novels, yet they’re never shown directly interacting, so this rectifies it.
We’ve been told that Jaime approaches Jon as he’s overseeing the polishing of Needle, his gift to his sister, Arya. Ser Jaime begins amiable enough ... but as you can see from his grip as he pulls Jon towards him, there’s also something menacing in how he interacts with Jon as he asserts his arrogant dominance.
A trivial detail: the item you glimpse down between Nikolaj Coster-Waldau’s feet is a mark so that the actor knows where to stand for the camera. I believe you can just glimpse Kit Harington’s mark as well.