Great shot! I would print this to 8x10 or 11x14 and give it to the firefighter. That would very likely gain you some access to the next fire....
You nailed the exposure right down! However, in chancy situations like this, the AEB capability of your 60D along with your User Selected Mode are your friends. Just register a one or one-half stop AEB along with burst mode as your User Selected Mode and you can select those parameters with a simple turn of the mode dial.
That way, when you come upon situations in which you might worry about the exposure, simply select the User Selected Mode by turning the mode dial and cease worrying. You will shoot three exposure bracketed shots at 5.3 frames/second with each press of the shutter button and then quit shooting until the next press of the shutter button.
It is unfortunate that the "Canon Gods" decided to reduce the three User Selected Modes of the 40D to two modes on the 50D and a single mode on your 60D. I am thrilled that they reversed their thinking and decided that User Selected Modes were important; providing the 7D with three User Selected Modes.
The User Selected Modes capability is one of my favorite bells and whistles on my 40D and 7D. I usually have one mode set up for shooting action, one mode set up for AEB and another mode set up for panos with manual exposure.