I'm trying to remember if Energy Aura gave you the ability to deflect damage back to the enemy.
Anyone remember?
No. There was no 'reflect damage' mechanic in the game (or at least not a functioning one). Closest you get is damage toggles, which EA didn't have.
And the closest simulation of that which EA had was the stun toggle in the stalker version... at least it did something to the bad guys.
Maybe you're thinking about the repulsion field of Kinetics: Repel?