Similarly, [if] an olive press, which was built in a rock with a garden above it, partially caved in, the owner of the garden may go down and sow [his seeds] below until [the other] makes a dome for his olive press.  [If] a wall or a tree fell into a public domain and damaged, he is exempt from paying. [If] they gave him time to cut down the tree or to demolish the wall, and they fell within the time, he is exempt; after the time, he is liable.