Fenrir just seemed to smile when Nix petted him and laid down where he was. Fenrir was not under orders to really do anything from Yomi, so he just watched the human in the water and what she did when she got out, as well as the other demon that might be around. Fenrir watched somewhat amused when the human punched Nix in the face, knowing what might happen to the woman now. Fenrir had also informed Yomi of what had happened, and she quickened her pace to get to where Nix was faster. She arrived as Nix teleported in front of the girl and was most likely going to show her what she feared most. There was nothing Yomi could do for her for a couple of reasons, one being so far into demon territory, two being seen by Nix, and three punching Nix. So Yomi just watched from the opposite side of the river halfheartedly for a bit, before turning and looking for the source of the other demon and if there was one. Yomi told Fenrir to watch Nix and tell her if anything changes while she searched for the other demon.