It was a simple enough promise. And not one she hadn't heard from others before; both Gintoki and Sieglinde had both made her recite some form of a vow with a similar intention, and each time Olivia had hesitated... but in the end she always acquiesced.

"I promise," she says this time again, knowing full well that she may possibly end up breaking it, should things ever come down to it. But she also knows she doesn't do these things on purpose, and so there should be some credit allowed for that. Decisions like that — in saving yourself for the sake of the majority at the expense of one other life — those decisions cannot ever be made lightly.

But here, in this quiet moment between two women, a simple promise can be made. She only hopes Serene would have the capacity to forgive her, should she ever find herself breaking it.

"Please get to somewhere safe," she says again, this time attempting a smile of reassurance. "It'll all be alright."

She draws away then, because time is precious, and quietly follows the trail of blood Serene had left in her wake.