Is there anything to show what happens when Weeping Angels touch? Do they displace each other? It would seem to me they could use this to provide each other with unlimited life. Displace an angel a few hundred years and you get a lot of life (since they are long life creatures), then when that angel comes back to the present, it could displace the first one.
Do they displace each other? Or become aware of each others' existence and position so neither one can move from then on?
Can they touch and survive? What effect does touching one angel have on another?