The verse you are missing goes something along the lines of

Now when the bricks had fallen from the barrel to the floor, I then outweighed the barrel and I started down once more. Still clinging tightly to the rope, My body racked with pain. And halfway down I met
the bloomin barrel once again.

The force of this collision halfway down th office block
Caused multiple abrasions and a nasty case of shock
STill clinging tightly to the the rope, I sped towards the ground and I fell among the broken bricks that were all scattered 'round