wtc7 building fell straight down from its base floorwtc2's top 1/3 fell into its bottom 2/3's but shifted east first then down.  The falling floor fell into the stable floors the force ejected much of the outer skeleton and other contents out into the air into a freefall.  wt1's  top 1/5 fell almost straight down into its bottom 4/5's and then you can see the antena tilt.  60 Floors of the west skeleton stood for 20 seconds after the rest fell.