How to Make the Supporter Scream Warchief Battles in Middle-earth: Shadow of Mordor
Sometimes the way to get a Warchief to appear in Middle-earth: Shadow of Mordor is to make one of his supporters scream.
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How to Make the Supporter Scream
The way that is done is that you grab the supporter and hold him for 20 seconds. Note that you will have to kill any other orcs in the area since they can interrupt the screaming by attacking you.