Ya sorry op Rip ...another young one taken too soon....
If it ever happens again that bad the best 'last ditch effort' you can do is fix the stem pronto, (wrap the split in grafting tape or saran wrap, spray the whole thing with water and cover it in a bag. The humidity will keep it perked up and if it can recover that'll be the best chance. Of coarse you need to shade it out no direct sun and heat until you see it's doing ok again and air it out at least once or twice a day. I do this when/if I break a big branch while training or if the wind messed it up outdoors and it works if it's fixable
If it's not crispy yet this could still work for you. Remember no direct sun try to keep it from cooking inside the bag (clear bag)
Good luck. And if all else fails chalk it up as a learning exp.... No loose boards around plants
