Loki will probably be getting injured just because the fighting is so nasty and he's going to be hanging with Thor a lot of the time I think. So he can always go to Raine for healing. Alternatively, he can swoop in to give her some help/save her if she needs it. He's going to know very early on how screwed they all are in this fight, so he's going to be a good team player.

And there's always early late day 3/early day 4 if you'd be interested in having Raine encounter him when he's completely she'll shocked and going into a mental death spiral.

So really it's up to what you think would be interested. I'm open for anything!