> Well, let's think about this. The building could randomly implode

Buildings don't randomly implode, they follow the laws of physics.  I would 
imagine firefighters are quite skilled at knowing what to look for to decide 
if a building is likely to collapse or not.  Even as a non-firefighter I am 
quite sure that if my cooker has been on fire for 5 minutes my house is not 
going to fall down, but if I see a wooden barn has been alight for half an 
hour I'm not going anywhere near it!

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