Final answer:
The provided text excerpts do not detail Nestor's reaction to realizing Telemachus's companion is Athena. For an accurate depiction, one must refer to Homer's The Odyssey where such an event is described.
Step-by-step explanation:
Nestor's reaction to realizing that Telemachus's companion is Athena is not detailed in the provided text excerpts. The given passages do not address the question directly and instead offer different contexts from various stories, none of which describe Nestor's encounter with Athena and Telemachus. To accurately answer the student's question, one would need to refer to Homer's epic poem, The Odyssey, where the actual reaction of Nestor upon the realization that Telemachus's companion is Athena could be found. In general, characters in The Odyssey show reverence towards the gods, so it could be inferred that Nestor would react with respect and awe upon discovering Athena's true identity.