For a moment, Diarmuid doesn't know what to say. How can she not know how something as common as collar changes work? Especially when she has been here as long as...

And then it hits him and he frowns. With his own seventh death and the odd changes to how things went so fresh in mind, why didn't he think of this before?

"Nesir, have you died recently? And...have you died a lot?" Diarmuid's questions are tentative. He doesn't want her to think he's judging her when he is just trying to figure out if she fits the pattern or not.