The situation was laid bare for Samsara to see. How would they respond?
They had to chase after One Inch Ash. Just because he only had 6% of his health left didn't mean that he was no threat. If they let him go free and he placed down a few ghost boundaries, the situation would take a turn for the worse.
But if they gave chase, how many people did they need to send after him?
One? Two? If they sent too many, what would happen to Moon Luring Frost? They couldn't let Demeter complete this trade. A character with 6% health for a character with more than 50%? That trade was too lopsided.
They had no time to carefully analyze the situation. During the small window when Ever-Stay and Cloud Piercer shifted their focus to One Inch Ash, Soft Mist and Stolord were about to reach Moon Luring Frost.