Will the meaness ever end!?

Remember when I posted about Lynx going after Shirley?  Well, he is still at it!  Last night we were watching T.V. and Shirley was sitting by the love seat, minding her own business, when out of nowhere, Lynx jumps at her and hisses!  Shirley yelped out of fear and huddled under Jeb!  I just don't understand why Lynx won't leave her alone!   Even if Lynx walks by her and looks at Shirley the wrong way, Shirley cowers down!  And Lynx is only mean to HER.  He does nothing to our other cat Luci, and he is as sweet as pie to us!  How am I going to fix this?