[ Cecil's alarm mirrors that on Lancelot's face and she actually fears for the man, feels guilt for bringing him more pain. He isn't the first person from another world that she has healed here in the Tower, but he is the first she's ever seen react to her magic like this. ]

I-I'm sorry.

[ She tenses her jaw and swallows hard, resolving to try again lest the Master's condition worsens because of her. She casts again, but this time, she uses only a Cura spell, the glow of light in her fist green instead of purple. ]

The... Esuna spell was trying to remove them from your body. I apologize— I did not know. This will only heal your injuries— broken bones, lacerations, bruises... It shouldn't aggravate your... familiars.