[alatar]

The first few layers of skin burnt from the Steward rather quickly, leaving him in so much agony that the pain center in his brain shut down and went home for the day. Purportedly there is evidence that when an animal (and possibly human) is in pain and about to die that the body can shut off the pain (why bother sending the message) or send in enough endorphines to smooth things over.

Also, we may want to test the effect of a large intact of tomatoes has on one's flame retardance and running speed (Don't be stupid, by the by). And, one may think that the flames reduced the Steward's mass, making it a little easier to run, and the flames surely gave some lift as well (hot air rising and all).

But in the end methinks that, at that last moment, Denethor finally came to his senses, left despair behind and ran out to due his duty, diving for a Battle Troll.