Are agglomerations of larches (high altitude asymmetrical trees) difficult to burn?

Regions: Floe Lake in the Kootenay National Park, British Columbia, Grasshopper Pass and Harts Pass in the North Cascades, Washington. Altitude, approximately 2000 meters.

The following information is dedicated to biologists and experts in forestry.

These five PDFs files do not include written explanations as they are conceived for a visual reading. If you have difficulties reading them, it is recommended to view them more than once while listening to unified music (high level of connecting sounds that can help the viewer to concentrate...). They are also meant to be viewed in progression, as each file evolved from the previous ones. The purpose of the enclosed photographs is to document the fires mentioned above, and the cameras used were of amateur quality. The accompanying word file.rtf  (T En 1). 
The two elliptical blue purple ellipses below each image, are the links to the PDF files. The top one (750 x 7500 pixels) is for one computer screen and the bottom one, for multiple screens or a projector (3000 x 30000 pixels). The size of these vary from 1.11mb to 17.9mb. They can be printed, quality internet.

MINIMAL EXPLANATIONS
FIRE 1A: In September 2012 on my way to Floe Lake in the Kootenay National Park, British Columbia, I realized that there had been a lot of forest fires, some reaching the tops of the mountains (first 2 photos, regular fir trees = symmetrical forms and almost straight lines). I wanted to visually document the large agglomeration of larches around and above Floe Lake, and was wondering if the fire had reached that area. 
As I was hiking, at about halfway towards Floe lake, I noticed that in the alpine meadows, there were some yellow orange larches further up (3rd and 4th photos). The fire had stopped slightly before reaching the lake, due to the elevation / wind / rain or maybe the mixture of regular fir trees (green and symmetrical) with larches (yellow orange and asymmetrical)? The fifth photograph is a view of live larches above the lake, there is a large amount of smoke in the air from surrounding forest fires.    
                                 
FIRE 1B: Different views, from Floe Lake up to Numa Pass 2355m. The above photo number 6 was taken on a clear day by someone else, which I downloaded from the internet. The above photo number 7 -below average quality - was taken during a summer in early 2000s. Before 2007, I rarely used photography for recording nature because I felt that this walking visual experience is about mind expansion.

FIRE 2: Different views from Grasshopper Pass in the North Cascades, Washington state. From a distance and directly to the obvious cut line separation (left, larches = no fire / right, rocks and regular fir trees = fire). The fire was stopped by the rocks / wind / rain / altitude, approximately 2000 meters ?

FIRE 3A: Different views, south and west in the surrounding area of  Harts Pass in the North Cascades, Washington state. The fire was stopped by the wind / rain / agglomeration of larches / altitude, approximately 2000 meters ?

FIRE 3B: Different views, east-south-west in the surrounding area of  Harts Pass in the North Cascades, Washington state. The last two images: Regular burned fir trees (symmetrical or almost straight line) versus a few burned larches (asymmetrical). The fire was stopped by the wind / rain / agglomeration of larches / altitude, approximately 2000 meters ?

For more information, please view natural connecting image 56C (1d-last image, 2b-last image, 2c-image 7, and 2d-images 2 and 4) on a LARGE SCREEN (3000 pixels high) or a PROJECTOR.

Jean-Jacques Giguère © all rights reserved