Your melee attacks deal additional Fire Damage.
Also, when your shields become depleted you create a fiery explosion, damaging nearby enemies.
Your shields must fully recharge between explosions.
While you have an enemy Phaselocked all of your shots that hit enemies have a chance to ricochet and hit another nearby enemy.
Chain Reaction only works with bullets.
When you take Health Damage there is a chance that your attacker takes damage equal of the amount of health you lost.