By observation and guessing! It's been a constant theme in the setting that moonlacing heals almost everything.

Moonblessed may observe details such as:
- As stated on the log, "absorbing Chroma through the lips." There is a visible light that signifies that's the body part Tarn is draining Chroma from.
- Audiences who are furthest in the back or overshadowed by others aren't as affected as those who are in the front row.

You are free to creatively come up with other details that align with the events of this log.