Ahhh a problem I have, and the water bottle thing has not worked for us. I can tell she was terrified like he was going to do it again so she fled. There was an article I saw to help stop this problem, I havent done it yet, but Im sure thinking about it.
They said to put one cat in one room for a week, and the other cat in another room for a week, then after the week, switch them and wait another week. does it work ,? I havent tried it yet, but Im sure thinking about it!