I went out this morning to take pictures of the fence damage and have come to the conclusion that stupid dog got in my yard and broke the fence trying to get at Lexy (probably after chasing the other cats around first--they were all pretty panicked and ran inside when I was running out) I couldn't hear anything until the growling because I had the door shut.
The screws are only in about 1/2 inch, but it takes a lot of force to do this amount of damage. The attack happened right beside that bush on the terrace. Lexy was undoubtedly outside the fence in front of deranged neighbor's house on the left and tried to get home when he heard the ruckus. I will give these pictures to the Sheriff when he gets here on Monday.