Amaru isn't one to pull any punches. When she has you in her crosshairs, she will use whatever she can to inflict the most damage. Amaru has learned that Kate's memories and feelings are very useful when facing Seth and Richie.
Burt: The first thing you're going to do is get your house in order. You need to mend fences with the ranger. Richie: Look, Mr. White Hat was pretty clear. He does not want to see me.