

The titans I know, but the gears have a base speed of supersonic speeds, with Mikasa and Levi's speed and skill with it enhanced to such a degree, they appear massively supersonic.

He will block one hand, then throw his shield, and be bitten in half and gulped down. Put Captain as a titan killer and imagine the scenerio. Moving that fast is as much an anime trope as it is an ability of his. He's one of, if not the, fastest Titan killer, but it doesn't mean he can dodge bullets. None of Levi's feats prove him to be a bullet-timer. Eren didn't fight back at all, and isn't on Levi's level, so that's moot. I've seen every episode of Attack on Titan. Certainly faster than mere biullets there. At erens execution, just for show, he beat the heck out of him, fast as heck. the gif suffices to prove his speedblitzing powers. You need to watch the episode where he spedblitzed the female titan while being injured due to mikasas crap up, where he basically moves so fast, the titan didnt have time to grow his armor.
