Lunge enchantment should only apply when airborne.

In most circumstances when it comes to utilizing the Lunge enchantment as a movement tool to close the gap in combat or to move around, you want to be in the air to maximize distance and speed, and it gives you some exhaustion to make up for it. I believe what could be fair is to only have it apply when in the air, so you can still use the jab attack normally for combat without being penalized as long as you are grounded.