Kite's ability is pretty awesome, and it is hilarious how he constantly complains about it.
And I love when the one ant remembers his own previous death. If the ants are still part human, is it really alright to kill them without a second thought.
Finally, that last quote by Kite was haunting. We've already seen part of that of course when Gon encounters the Spiders and gets mad at Nobunaga. But we've now also seen that all ants are not really mindlessly evil, such as Colt. The writing this arc really is superb.