The AV with his healers are quite aggravating, however, not unkillable. I like it that the last AV in that TF was a good challenge, my sg loves a good challenge, we thrive on aggravating, extremely difficult missions. I'm sure there will be more efficient ways to kill that last AV with less aggravation, but for now killing his healers one at a time from far enough away to keep from being used to heal has been effective--just takes time, can do in about 2 hours. BTW, I love the hot chicks in the new TF O.o (especially the red head)
