ok so here is what I am having a problem with: we see Lisbon hear a bang and then the house explodes. So sheriff(aka red john, unfortunately) reveals that the bang was a flash grenade which he used to knock everyone out while he got the substitute body and set up the bomb. this had to take him like at least five minutes. how does this explain the bang followed only seconds later by the explosion? I mean even people who aren't fanatics can see the inconsistency there. That is just awful writing. So please let me know if I missed something that explains this.