Start from the beginning.
1 - Close on Power Lad's face. He is mighty angry and indignant.
POWER LAD: Who dares?!
2 - Wider shot, with Power Lad - still on his knees - on one side of the panel and Knight Terror - the newly arrived figure - on the other. Knight Terror is a heinous looking dude, about as nightmarish as his name would imply - maybe he's got a knight motif going on, with an all black suit, dark red glowing eyes on his helmet, spikes on his shoulders, claws on his gauntlets, and that kind of thing. He stands in a heroic pose that doesn't jive with his outfit. Power Lad's expression is blank - maybe have a dotted line drawn from his eyes to Knight Terror to emphasize that he's trying to take in what he's seeing.
POWER LAD: ...
3 - On Knight Terror, who looks confused and embarrassed by what he's hearing.
POWER LAD (off-panel): You're a superhero?
KNIGHT TERROR: Why does everyone keep asking that?
4 - Knight Terror pulls out a book and scans its text, which is the focus of this panel. As you may have guessed, it is the "Zero to Hero" book seen on page 1.
KNIGHT TERROR: Am I not doing something right?
5 - Close on Power Lad's face. He is incredibly surprised (maybe have some "manga surprise lines" coming from his head to emphasize this).