OK, so regarding the chain thing. You're very likely to succeed and you can get 10 feet away with all your movement and taking an AoO from the Ramfish, but you would be able to see the Hippocampi is just dragging the chain downwards. So it'll fall under gravity to just be next to the Hippocampi still, if at that moment the momentum of the chain was heading up it might get pulled back out of the beast's reach, but right now the Hippocami is descending. I might have it make a reflex save to grab hold of it again quickly enough or are you envisioning something else? I like your idea I'm just not sure what this is looking like in your head.