When Ace heard Grim Ancestor's wails and looked at the cocoon, he didn't know what to think about Freya's ruthless innate ability. It looked simply too evil and torturous, and if he ever encountered an opponent like her, he didn't want to be captured alive!
"How much longer do you need?" Ace tried asking Freya with a very mild tone as if he was afraid of breaking her focus through the house call, which had been activated since the day he contacted her so they could easily talk in secret.
But when he thought about the commotions Grim Ancestor was making, he knew Freya would be fine.
Furthermore, after he told her about Eva's status, he noticed that Freya appeared to be somewhat aggravated, and he knew things were not going to be smooth sailing anymore.