Has the Hulk ever reverted back to Bruce in mid fight?

For instance, has he ever gassed out, used up too much energy, etc?

Not that I can recall, when somebody knocks out hulk he reverts back into banner. He's never run out of energy as his stamina is pretty much limitless so he can fight indefinitely.

A premature reversion?

What about his fight with Sentry?

@mortein:

That was kind off the end of the fight

When Surfer drained him.

Proxima Midnight in Infinity turned him back into a human.

There were a few instances of characters reversing him back to Banner via mental or empathic abilities or draining jis energ and at times some did so without much of an explanation on how. Also in the Greg Pak Hulk run he reversed back on purpose because in his Hulk state of mind he could not bring himself to kill his son, so he shot him as Bruce. Then there was a time in comics in which Hulk would actually get weaker with anger and eventually revert to Banner, I believe. Turning back simply because he got tired or the like did however not happen to my knowledge so closest thing being his battle with Sentry, where he turned back during the final blow, then became Hulk again shortly afterwards.

Yes