Had an incident recently where I left the lights on to my '96 XJ 4.0 and killed the battery. During the jump it wouldn't start unless I gave it some gas and wouldn't stay running less I gave it gas as well. Computer eventually relearned idle after a couple times driving but to keep it running at stop signs I continued to give it gas at the same time as braking...which got me wondering. When you power brake a 4.0 what does that do to the clutch. If you can rev the motor without the wheels turning wouldn't this wear down the clutch? I'm just generally a little undereducated on how the clutch comes into play other than when shifting gears.

Thanks