No interferences, and no one will intervene :) This is between Kili and Thorin; an opportunity for Kili to work up the courage into talking to his uncle for Saeril :)

How about a "as soon as Kili saw the stone, and was told to do such an order, he expressed disbelief" kind-of scenario? The arguement takes its toll, when Thorin perhaps says something offensive about Saeril, maybe? This probably would make Kili snap, and Fili might step in to prevent further damage :)

You see where I'm going with this? :)