Yikes. I'm not one for prayer, but I do wish him to have a full recovery, if it's possible. Remember one thing: love and support is more powerful than you think, and that's what Ace needs right now. My late niece, who was born with only the reflex part of her brain, survived and acted as a normal child for nearly a year. I hear she even said her first word, though I didn't witness it myself. She was surrounded by loved ones the entire time, and I thoroughly believe that's what kept her going.
So make sure you're always by your friend's side and do whatever you can to help.