1. Hamlet's odd behavior: Gertrud is speaking about Hamlet's unusual and strange behavior. This particular incident takes place after Hamlet's encounter with the Ghost, where he appeared disturbed and spoke cryptic words to Ophelia, leaving her confused.
2. "Bend eye on vacancy": This phrase suggests that Hamlet is staring at nothing in particular, almost as if he is lost in thought or disconnected from his surroundings. He seems absorbed in his own thoughts or fixated on something unseen, which appears vacant or empty to others.
3. "Incorporeal air hold discourse": This line indicates that Hamlet seems to be conversing or speaking with an imaginary presence, an "incorporeal air." This might allude to Hamlet's discussions with the Ghost of his father, which others cannot perceive or hear, making it appear like he is talking to himself.
4. Concerned tone: Gertrud's words carry a tone of concern and worry, reflecting her anxiety about Hamlet's mental and emotional state. She is trying to make sense of his behavior and expressing her distress at his erratic actions.
5. Foreshadowing: Gertrud's observations about Hamlet's behavior provide a glimpse into his deteriorating mental state and hint at the further tragic events that unfold as the play progresses.