When you DLV your are essiently putting a gap between you, I'm up here ^ your down here v. You've made them feel like you think they aren't worthy enough so they attempt to prove to you they are of equal or greater value. The idea is to put them into a position of where they are consistantly struggling to establish that value. Why do they want your attention? Because you've effectively demonstrated you have a higher value to the group and alternatively lowered theirs at the same time. Cat/string isn't one specific thing you do, it's how you treat your target using a combination of methods described throughout these boards. The point is your target will subconsciencously fight for your attention as long as they think you'll take it away. When they realize they have your undivided attention they've reastablished their value which you just comfirmed for them aka you've handed them the string.