The first picture I saw was early on during the fire... right? They had the truck up in the air squirting water. Maybe after they got lots of folks there, they turned it off and then went inside, then I am wrong. BUT, when the operation is a truck squirting water from above onto the fire below, it is in order to prevent the fire from spreading from building to building, it is NOT designed as a strategy to save the building which is on fire. I could go on, but that is the sum of it.
I was commenting on the strategy they took, which was correct since the building was coming down anyway. It was not an attack on the fire fighter's abilities or on their strategy. If one wants to save a building from a fire, the fire fighters must take an aggressive approach and fight the fire from within the building to extinguish the fire and also so as to prevent water from destroying what is not ruined by the fire already. It is Fire Fighting 101. I base my opinion as a 30+ year veteran of a municipal fire department and over thirteen years as a fire chief officer.
Your comments lead me to believe that after the other local fire departments showed up, they took an aggressive approach, probably turned off the truck from above the fire and went inside to mop it up. That defensive/offensive approach would work well for a department not having the resources to fight such a fire with ample resources early on during the emergency.
Editd to add: So it was the construction workers who caused the fire? Not unusual at all. Fire like that can get a huge jump on everyone as they might not be detected for quite a while if the building is abandoned. So, I guess the building wasn't coming down, but was being remodeled for the new occupancy? Arson/fire/investigation is an art, time consuming as hell, and boring as heck unless one really enjoys that kind of challenge. I did it for a while and found it on the boring side. Several of my fire fighters enjoyed it and worked for national arson investigation teams for extra income, a couple even quitting the fire service to perform this lucrative job full time. I just didn't enjoy sniffing around in some burnt ruins for three days trying to put the puzzle together. I'm glad in this fire they fond the cause rather early, but sometimes even the obvious is not what it seems when it comes to fires, abandoned buildings, insurance money, etc.
Your second picture... is it the same building? The fire building looks two story and the last image looks like three stories. Hard to tell what was saved and what was lost to the fire by seeing only that.