 In this video, which takes place in Iraq, some troops have packed a house with C4 in a training exercise. You wait for a good 30 seconds or more before the explosion actually goes off. I'm not sure what that dust cloud is in the background behind the house either. But when the C4 goes off it totally levels the house and blows dirt and pieces of house everywhere. There is so much dust you can't see a thing. The screenshot there is the exact moment of the explosion before all the dust obscures it. Bet the Chinese never thought it would come to this when they developed gun powder eh?
Watch some soldiers take out a house in training. Source: Big-boys.com | 
