Approach the helicopter to display a short cut-scene.
Monitor the bar visible in the right upper screen corner.
It can’t get empty, because then the mission will fail.
The chase will end after reaching the military base in location [728, 602].
Also during this chase you should rely on long jumps and glide option.
During the chase, ignore hydras appearing in the area, because you do not have to fight them.
Watch also out for attempts to slow down Heller by other evolved.
The chase will over after you reach the oval building in location [490, 280].
So I suggest starting with this objective, because later on you could have no time to complete it.
you could start using your favorite attacks only after completing the bonus objective.
Do not let your opponents surround you and have a go at attack them one after another.
Avoid also brawlers, which can be summoned by enemies.
It is best to ignore them, because they will die, once their “master” is dead.
After completing this mission, the game will unlock the next one -Lost in the System.
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