Ive also tried the fighting purr's,with mixed results,Untill I added a visual for them.I have two black pieces of cotton fabric slightly bigger than a good sized handkerchief.It's splashed with white markings.On a tag team effort,one person commences to start the fighting purr sequence,while the other sit's slightly behind the caller with one of the rag's in each hand.Jerking your hands up and down gives them the visual that they know they should be seeing.Killed several this way.