During Act 5, Scene 8, Macduff maniacally searches for Macbeth during the battle. He is so overwhelmingly angry and must kill Macbeth no matter what comes his way. I imagine that Macduff has an angry face and constantly checks his surroundings for Macbeth like the gif above. In a sense, every singly one of the soldiers are looking for Macbeth in a similar way because the armies would not have gone to war if it weren’t for Macbeth killing King Duncan in the first place.
Grinblatt, Daniela. “Guide to Looking Cool While Eating Alone.” Blogs. The Daily Clog, 14 April 2014. Web. 20 March 2016.