It started before Tommy when Jemma was sick and had to be confined (so we could give her her meds). I guess it changed the dynamic because before that all was well between the two. It was actually Jemma that was not fond of Jessie in the beginning. Sigh, males are just so much easier lol. It usually does help separating them for a few days, it shakes up the dynamic and the hierarchy gets shuffled. It also allows the chased cat to relax a few days and build confidence. The scared ones are the ones that get chased, not the ones that turn around and show their claws. Like real life for us humans I guess.