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There is so much to observe in all of these videos @Brigid !
I also made those same observations @Catherine . He is not crossing the threshold, and freezes. He is barking (higher pitched and even some whining it seemed in the first video, which switched to a deeper bark when approached in the second video). He is making eye contact with people, with his eyes wide at times, and at the end of the second video there is some avoidance (head turn, lip licking).
In the first video of the interaction between the two dogs, I observed Brody turn away as he was approached, while also baring teeth briefly. He froze and there was a shake off before he continued to run off and begin sniffing and eating.
In the second interaction video, Brody taps out when Timtam grabs at his neck and shakes. He sneezes and shakes off as he begins to get up. There is height seeking behavior displayed by both dogs and whining from Brody as Timtam gets rougher at the end.