Answer:
Dramatic Irony is when the audience knows something the characters do not.
Step-by-step explanation:
I can't see the passage you're talking about, so I'll use "Romeo and Juliet" as a general example. Juliet drinks a potion to pretend to be dead, but she's really just asleep. Romeo finds her and thinks she's dead, so he kills himself. The audience knew that Juliet was just sleeping, but Romeo did not. Makes sense?
Hope that this helped.