The thing was ...they[Jacks gang], were too cocky after getting 80 mill of Walts cash....got too comfortable which was a serious thing to do wrongly as you can't let your guard down when that is the place you chose to live in...risky business as they say.Plus the fact that they already frisked him and checked him over completely,outside.....i thought if anything was a bit on the fantasy side..was that they didn't check his trunk for bombs or anything like that...because they know that Walt was the king of gadgets and sneaky tactics,,,that would have been the first place i would have checked outside...actually made him open the trunk to avoid booby traps...but all in all the best series on the tube....as Walt said ...i was alive...to say the least,,crazy fucker.He got real bad in the end..especially when he killed Jane and poisoned a kid ...prick.