[It's definitely encouragement. Sabriel tilts her head at Felix's gaze, then nods gesturing for him to try again. When the spell succeeds, she feels a pleased smile creep over her face even as she reaches out, touching the mark with one unnaturally pale finger, before her smile gets wider. He's done it. Now, if he can do it repeatedly, she can start on healing.]

Congratulations- you've cast your first spell. Now, if you can cast it again two more times, without any failures in between, I'll teach you the most basic healing spell. [It's best to make sure Felix has a solid grasp of the basics of spellcasting before moving on, or singed fingers will be the least of his problems.]