She nods, several pieces clicking into place for her, and she did understand, but not exactly the way he meant. It didn't at all comfort her enough to quell the sudden jump in her heart rate. After so many years together, why would he make her promise such a thing if it wasn't something awful? It's already too late and she does feel like a burden, but if acting is all he wants... she could try.

A place like this with all its strangeness is not something she can fully fathom on how it could change someone, but from what she's seen so far, to so completely have Diarmuid changed that he... that's something she's still having trouble processing; his actions when he first saw her. The strongest and bravest man she had ever known.

With all the years of her life behind her, Grainne would be strong for his sake, if that's what he needs and wants. "I promise. Tell me, and I will not run."