Second Wind gives you an adrenaline boost when your health runs low. It is a Tier 4 Survival skill that gives you a little extra time to escape or heal in bad fights.
It is a good safety net for late-game fights.
Lightning Reflexes, The Alchemist and Six Feet Over.
When it triggers, break away and heal. Do not treat it as a reason to keep fighting.
Carry That Weight
Adds inventory space for crafting parts, traps and throwables.
Catch Your Breath
Shortens the wait before stamina starts to recover.
Eagle-Eyed
Extends the range of Survival Vision.
Ear To The Ground
Highlights enemies with an outline in Survival Vision.