D. Rex
Magic Eight Ball
Yes and no, Ender! You can use spell singing to heal wounds... But only on another spell singer.
See, "magic" in this setting is actually using a novelty programming technique to control and command nanobots, right? If you have the gift, that means you have a high enough concentration of active nanobots in your body to communicate directly with the RAN terminals - and other nanobots. If a person has few to no nanobots, they're basically "outside the network" and cannot be influenced.
That's where you get into some dark shit like instigating auto-immune disorders and literally hacking another singer's body to destroy itself. There's a reason banned knowledge exists - the Magi were too powerful for their own good, you know?
So no fireballs?