Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| No. in series | No. in season | Title | Directed by | Written by | Original air date | Production code |
| --- | --- | --- | --- | --- | --- | --- |
| 23.0 | 1.0 | "Confession" | Fred Gerber | Michael Duggan & Robert Palm | September 17, 1991 | 67416.0 |
| 26.0 | 4.0 | "Asylum" | Kristoffer Tabori | Teleplay: Kathy McCormick Story: Robert Palm | October 8, 1991 | 67409.0 |
| 27.0 | 5.0 | "God Bless the Child" | E.W. Swackhamer | David Black & Robert Stuart Nathan | October 22, 1991 | 67404.0 |
| 31.0 | 9.0 | "Renunciation" | Gwen Arner | Michael S. Chernuchin & Joe Morgenstern | November 19, 1991 | 67414.0 |
| 33.0 | 11.0 | "His Hour Upon the Stage" | Steve Cohen | Robert Stuart Nathan & Giles Blunt | December 10, 1991 | 67407.0 |
| 40.0 | 18.0 | "Cradle to Grave" | James Frawley | Robert Stuart Nathan & Sally Nemeth | March 31, 1992 | 67424.0 |
| 41.0 | 19.0 | "The Fertile Fields" | Ed Sherin | Michael S. Chernuchin & René Balcer | April 7, 1992 | 67425.0 |
Question:
Who is the written by when the title is "his hour upon the stage"?
Answer:
Robert Stuart Nathan & Giles Blunt