First of all, the glass of the windows probably got extremely hot, both from the heated air of the fire and the fire's infrared radiation. Just as does every idea that we've been talking about, the concept of activation energies gives us tremendous power in understanding how the world works, even in unusual events. For instance, you've heard about the dangers of nitroglycerin, a liquid that explodes violently just from being shaken hard or jarred sharply. Of course not. It must have a very low activation energy, Ea.
Explosives form hot gases so rapidly because they have oxygen atoms as part of their molecules.
Thus, they are not limited in their reaction rate by access to atmospheric oxygen. Alfred Nobel was driven to invent a safer explosive when four workers and his brother were killed in the family nitroglycerin plant. They didn't detonate just from being hit or dropped. Obviously, therefore, an energy diagram for dynamite must look like the dotted line, a considerably higher Ea indicating that more energy must be put in, e.g., by a blasting cap, to initiate the spontaneous decomposition of the nitroglycerin. Dynamite has been mainly replaced by other explosives for excavation, etc., today.