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This guy is not normal. I’m telling you. Did you see his eyes? He’s got crazy eyes. He’s a lunatic. I’m telling you, we are goin into the wilderness being lead by a lunatic. He’s behind me, isn’t he?
— Mitch · City Slickers

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
Mitch is spiralling with nervous humour, insisting the person in charge seems unhinged because of the eyes. The joke builds as the worry escalates from odd to lunatic, then ends on a sudden dread: the speaker wonders whether the lunatic is standing right behind them, listening.
Context reviewed