AH HA.
I just found the next button and found the pick of the trebuchay.

Most definatly a lil mistake there...
tThe line thats still atatched to the trebuchay should be the one releasing.
And the one that detatched should still be attached.

In that pic Its defying the laws of physics in a number of ways.

But the bigest way i can see, Is the fact that the detached line could not have come loose without 1st detaching the line thats still atached.