It looks like it was really fried on that hot day.I'd take it out of the full sun for awhile,not complete shade,kind of dappled light if possible and gradually give more light. What's the potting mix? Brady

What's the drainage like in the pot? It could be over watered with poorly draining soil becoming stagnant.

I lived and worked for 13 years in the oil fields of eastern Saudi Arabia,..Abqaiq to be exact. Shortly after arriving, I and a few others, ( very few ), decided to try our hand at gardening in our backyards, I wound up after two years, doing as all the other expats did, - plowing the withered/burnt fruits & veggies under and putting our energies to other endeavors. Sure, date palms grow there, but they are vigilantly maintained by the companies field workers/grass cutters, hired to do only that. Just wait till you are back in a normal climate to try planting mango trees. Where we lived over there, we got an average of 1/4 inch of rain a year, average hi temps around 85 - 110 deg F for 9 months of the year, although the humidity was low ! Didn't mention the frequent " Shamals " did I ? These are the vicious, blinding sand storms that pop up suddenly and last for 4 - 8 hours. Not trying to be negative, but why make it so difficult ? Unless you plan to live there for the rest of your life, ( shuddering now ), - wait till your work there is over and then relocate back to the " real world. ". Here in South Florida, it's paradise in comparison ! ( smile ) This post was edited by jofus on Mon, Jan 19, 15 at 14:04

I have heard of some trees having defenses that inhibit growth of nearby competiton. I dont know which species, sorry. No tree will grow to its potential in a pot, and they will grow slower potted. So I would say that they both need pots. You could use a five gallon bucket found where pro painters are working for free, just wash it clean. Just put a bunch of 1/4" holes in it on the bottom and some on the sides down low for drainage. Your mango should grow quickly in warm conditions. But remember they are tropical and have other needs than other trees. It may grow happily in a cheap colander, which promotes good roots for bonsai or before going in the ground. They make overwatering very hard to do in a gritty mix. Mangos have long leaves that are too big for bonsai. I didnt see where you live but mangos can grow but never fruit in some places. I live in Costa Rica at 1300 meters, and the trees grow great but fruit very little or dont fruit at all. A few hundred meters lower they fruit like crazy. I dont want to discourage you at all, but some other species may be better for you, so you enjoy the hobby. I would say ficus are a good tree to start with as they can be awesome bonsai and are not too expensive. Other people may have more advice. If you really like bonsai, join a local club. Your surely starting at a good age, bonsai is a life long journey of learning. I hope you stick with it. I like your energy and that you want to learn! Enjoy your journey and always ask questions...