Unfortunately, Knuckles' attacks weren't bound by many of the same rules as Pokemon attacks. He was no Pokemon. And whether Dig would hit flying types or not was not his concern. Despite saying he wasn't going to hold back, he had a few moves up his sleeve that might end this with intimidation over injury.

The ground in front of Cyrus erupted, plumes of dirt and stone and concrete lancing into the sky around a large boulder. It was about eight feet tall and almost as large around - it weighed many tons and Knuckles had rocketed it into the air. He hurled it... not at Cyrus, but at a spot about three feet to his left so it had no danger of striking him. It was his Meteor Crush attack and was one of his very last resorts in any given situation.

"You're gonna have to catch the next one bare handed unless you stop this madness!" he yelled as the rock left his hands.