“Every time I allow you to get hurt, the bond unravels a little. Eventually, it will make it harder to hear when you summon me. That could have been catastrophic.” “Oh,” she breathed. “Why didn’t you tell me that little detail before?”
My thoughts exactly. Any other news you'd like to share, Blackwell? Now would be the fucking time.
But this explains why he couldn't just magic her acid clothes away.