In The Avengers (2012), Hawkeye has the following conversation with Loki after being drawn onto his side:
Selvig: The Tesseract is showing me so much. It's more than just knowledge, it's... truth.
Loki: I know. What did it show you, Agent Barton?
Clint Barton: My next target.
Loki: Tell me what you need.
Clint Barton: I'll need a distraction.
[Barton grabs his bow]
Clint Barton: And an eyeball.
What is his next target refered to in this conversation?