This was the first time Luna saw a magic spell on this huge a scale. S rank magic was quite scary especially one that had the potential of damage as that of a natural catastrophe. She was feeling so nervous looking at the slowly accumulating dark clouds that she was unconsciously digging her nails into her arms.
When she found out about the nature of the magic from Bruce, her bloodlust could not be controlled through normal means. If she could go to the past, she would have brutally murdered the bastard father and son so as to avoid this situation today. But unfortunately even magic was unable to bring back lost time and opportunities. She vowed to make the bastards bleed if they managed to survive but before that she needed to do something to save Zach.