Responses
I think that Seth just felt that he was related to him because of their blood as all of them are related in a way, he was drunk as hell and I think in that state he just saw the face of his son in Horus and well... Horus was so focused in making Seth intoxicated and so out of his mind so he wouldn't notice anything was wrong
I forgot to ask one more thing I confused about.
in the scenebSeth cursed Horus in his childhood.
I suppose Horus and Anubis has same face????
cuz Seth thought Horus was Anubis