Anki can attack directly using its effect, but it will only deal half of his attack. This can be "negated" by using Forbidden Chalice during damage step so that it will deal 3200 damage directly. But it is best not to battle a monster with Anki with Forbidden Chalice because he will not get his search effect.
I dont get the effect with Anki, I saw it work when someone in WC did it and direct attacked me with 3200 but I try it and it asks me if I want to continue attack. I say yes and it forces me to attack a monster.