Day after a disaster part 2

I was once again sitting on the bed, looking in her direction as she stood up and went to the door to the shower. I was still looking, waiting for an answer. "Sure, but how does it work exactly?" She asked while standing next to the door, leaning against the wall with her back. She was looking at me, and I was looking at her. In a spiral of gazes, me and her. Just waiting for each other to speak.

"Well, it means that if you say a word, the rune will instantly teleport you back to the room. Even if you will be under an anti-mana barrier. Soul-binding works over that. You would just have to say 'teleport back'. And you will instantly appear back here, of course, only when it's needed." She looked at me with some suspicion, I think she knows that there will be some side effects of it, but it might just not be needed. It's the last resort kind of thing.