So I know it was mean of fujisaki to yell at hagusa/Yukine but I honestly think that when Yukine was in that state it genuinely messed with fathers head. Like he couldn’t think clearly and that is number one in a fight for him, because he’s a sneaky lil rat and uses his brain over actual fighting. So when Yukine got in that state he can’t sting father and we are not quite sure what type of memories he gets from the shiniki he names with the brush BUT they definitely have a mental connection and I think Yukine tends to be incredibly emotional in a very powerful and kinda mind jumbling way. His emotions (when strong enough) seem to override the emotions and thoughts of that god. Always thought yato was being dramatic a little bit because yknow it’s yato but it seems to be actually debilitating to the receiver of the emotion ,I know about the whole shiniki taking a toll on their health but this seems more, and only happens when he feels extreme emotions. And honestly I think father was legitimately scared and upset that Yukine could do that to him and he lost it for a moment.