[It was a little known fact, but Sephiroth had always seen to protecting those under his command. Though Luka is not under his purview at all, the requirement to protect him is just as second nature after their lengthy travels, his friend representing his only true anchor point to this world. Of course he’ll offer a healing spell when necessary, and without hesitation; it’s simple enough, and one of the first magics he ever mastered, despite his training to be a weapon made to kill rather than to mend.]

Make you more considerate during a fight instead of just rushing in.

[He jokes, knowing that being under the thrall is a monster was hardly Luka’s fault, and that neither really could have predicted it. The magic fades, having run its course through his body.]

But it only makes sense for a SOLDIER to know how to heal, too, in case he’s injured.