Why would you cut on the non-fire side of a fire wall?

Was this really necessary? Why would you cut a roof that does not have active fire underneath it?

Making a trench cut on the opposite side of a FIRE WALL.Why would you do this?

When you have a large amount of fire in an open attic space that you most likely will not be able to extinguish and the building is separated by some type of fire wall. Be pro-active and make a cut on the non-fire side. In the top photo we had three-story hotel wi