Final answer:
The provided texts are from 'A Doll's House' by Henrik Ibsen and 'Riders of the Purple Sage' by Zane Grey, and do not contain information about Noirtier or Valentine. Noirtier is a character from 'The Count of Monte Cristo' by Alexandre Dumas, and the query pertains to that novel.
Step-by-step explanation:
The passages provided do not contain direct information about Noirtier or him being brought down the stairs to Valentine's room. These excerpts appear to be from two different novels; one is from A Doll's House by Henrik Ibsen, which features the character Nora, her interactions with other characters, and a focus on themes of social norms and personal identity.
The other text seems to be from Riders of the Purple Sage by Zane Grey, highlighting moments of tension and action involving the characters Jane Withersteen and Lassiter.
To provide an accurate answer to the question regarding Noirtier and Valentine, one would need to reference the book 'The Count of Monte Cristo' by Alexandre Dumas, which is where these characters originate from. In the novel, Noirtier is Valentine de Villefort's grandfather, and he is an invalid due to a stroke.
However, without the direct text from 'The Count of Monte Cristo', we cannot confirm who brought Noirtier down the stairs.
In the play 'A Doll's House' by Henrik Ibsen, Noirtier is not a character. The given passages are not related to Noirtier or any character by that name. Therefore, it is not mentioned who brought Noirtier down the stairs to Valentine's room in the play.