Well damn. That move works better when it actually connects with the ground, or a rock, or a building. He's not fully aware of what Tyki's abilities constitute, but moving through solid matter seems to be one of them. Annoying, but not impossible to work with.

Aside from a mildly annoyed look when his quarry slips away, Zangetsu doesn't react to Tyki's intangibility trick. Hiding in the earth is a great trick... but now Zangetsu knows what Tyki's spiritual pressure feels like. He locks in on it, feels it move through the ground like a fish in water, coming up behind him. He can't move fast enough to grab the ankle, but he can move fast enough to bring the sword on his back up a little, protecting his neck with the blade. Then, with his sharp and curved talons locked and loaded, he kicks backwards to try for a stab and grab with his bird-like claws hidden under the soft, fur-like feathers.