Coming down the hill: which would  have to be a verb since a verb is describing an action, and 'coming down' the hill, is saying the action he is taking is going down the hill
        
                    
             
        
        
        
Answer:
Extravagant hypothesis.
Explanation:
Fallacies represent the error/flaw in reasoning that spoils the validity of the argument. An extravagant hypothesis is a kind of fallacy that occurs when an exaggerated or unlikely explanation or comparison is provided unnecessarily where a simpler or less elaborate description could work more efficiently. <em>Similarly, this example proposes an extravagant comparison(with 'aliens') that represents a flaw in logical reasoning(comparison here) </em>that neglects the effectiveness of the intended meaning. Thus, it exemplifies the 'extravagant hypothesis' fallacy.