There is no sigh, no need of breath while drinking, but it not absolutely silent - she can still hear it. Hear him drinking. Someone's blood. A person, a human (when did those become no longer exactly synonymous?) gave that blood, and likely don't even know what it was to be used for. They probably thought it was going to be used to save another human who needed blood. Not -

- This.

This, it's the moment of truth, isn't it? To determine whether her trip to the bar on his behalf was not completely in vain ("And why didn't you fucking ask him, then, if he knows the rules, since you're so fucking buddy-buddy with him."), or if she will be the alternative.

As he finishes, she can't help but look.