Where was Andy the moment the house exploded?

I have also wondered about precisely how Andy fits in to what happens to the house, midnightsun. He is wandering through Eddie's yard just before the explosion, yet remains unscathed. I find it hard to believe that the boy would have adequate time to get far enough away from the place to avoid all injuries. The only thing that I can gather is that Chucky rushes out of the home while it is still intact and tells his 'friend' to run. If that is the case, though, then why is Andy discovered at all? He seems to be spotted near the disaster, because he is still looking for Chucky, and taken to the police station after he says that his doll has murdered someone. It's ridiculous that the authorities think that a common six-year-old would have the means to make a house explode.