I think this is a brilliant little story idea. I love the brotherhood dynamic, and I love the way Mako looks out for Bolin, but I'd also like to see Bolin get a chance to do the same for his brother. Mako shelters him so much that we don't see much badass Bolin, but he's perfectly capable of going all out if he has to, and he'd definitely risk everything he has for his brother. Just like Mako would do for him.
I'm deeply curious...is there a fic and/or comic attached/planned for this? I'd love to see it if there is