On this page of our guide to Death Stranding, we have described the second encounter with Clifford Unger boss that takes place in Chapter 7 of the game. The duel with the boss will take place in the ruins of a city that was the battlefield of World War II.
As in Chapter 4, you have to reach the place where you will witness a cut-scene that shows Clifford Unger (the game will still use the name of Combat Veteran and The Mysterious Man). It'll happen soon after you get out of the sewers. Only then will the new hunt for Unger begin.
Before you even start attacking the boss, use a scanner to gather as much supplies from the area as possible (some of them you could find on your way to the sewers). Get interested in blood bags, firearms and grenades.
You have to travel through a ruined city and look for Unger. An antenna will help you locate him - it always turns (indicates) to the place where the boss and his vanguards are currently staying.
Once you have found your enemies, always focus on identifying and attacking Unger - by weakening him enough you will push away the whole group. Unger will be more durable than in Chapter 4, but you can get cover and hide behind sandbags or building walls while attacking him.
When hunting, watch out for Unger and his men as well as soldiers with rocket launchers. Deal with them on an ongoing basis so they won't cause any additional threat.
After you have weakened Unger sufficiently, he will move to another place on the map. Then, the whole cat and mouse chase will restart. You have to defeat him four times in total. It will launch a new cut-scene. After it, chapter seven will end.