He had made his decision.
Starbuck pulled the gun up and aimed for Ahab's heart.
At that exact moment, Ahab woke up.
"WAIT! What are you DOING?!?"
Starbuck dropped the gun. That's how surprised he was.
Um… Well… I was just going to… Well…. You see… I can explain! You know what? Actually, I'm not going to explain!" He aimed the gun, again, on Ahab's heart.
"Wait! You can't do this!"
"Oh, yes, I can. Watch me!"
And with that, there was a boom.