[Jekyll staggers, it's such a sudden feeling of dread, not so dissimilar from the feeling commonly associated with Hyde taking control. That's his first thought, and considering it it's just his Master there, he won't try too terribly hard to fight it...but it doesn't come, and then he realises. It's so strange for this distress to be felt secondhand, for it to come from Lucifer of all people. And that is therefore all the more frightening.

The moment he realises, he runs from the kitchen back into the other room, with all the speed of a Servant behind him. Well, as much as he can manage as a Powerless Shell. His Noble Phantasm is in the laboratory, in his coat pocket - but at least now he has learned to summon it to him, something he is very grateful for at the moment, as he is almost certain he'll need it, especially after hearing that thud. He rushes into the room with the phial in hand, stopper already pulled from it, ready to drink to defend his Master and his home from what ever threat there may be. Terrifying as it may be to imagine something that could harm the devil himself.]

Master--!

[He shouts to her the moment he leaps into action, and the word is hardly out of his mouth before he's at her side. There's nothing there, though. In one sense, that's a relief. In another, worse still. Kneeling by her side, Jekyll lifts her body into his arms, under her knees and around her back, holding her against his chest.]

What is it, are you alright?

[Whether or not he gets an answer, and no matter what that answer may be, he's taking her to a bed.]