Why does Hingest decide to get out of NICE?

After the vote, Hingest tells Mark that the vote over Bragdon Wood was just a show. N.I.C.E. intended to have Bragdon Wood all along. He alludes to the groups unthinkable plans and tells Mark that he no longer wishes to be a part of them. He advises Mark to go back to Bracton and adds that he will be leaving that very night.