Ok. There is a glitch with minecraft that can make people look like they are either hovering in the air or be stuck in the ground. It is not a hack. It just happens sometimes and I have no idea what causes it. Please don't blame people for hacks unless they are really hacking.
But you are right about there being lots of hackers on. I recently played four games in a row and each one had at least one hacker. So hopefully the hackers die down soon.
*Edited to fix the quote*
Generally, what causes this bug is lag - which makes sense if the guy couldn't hit him/he was teleporting around. Could have been a random connection lag spike for you, FlawlessWolf. (generally users being in the ground/air is lag on your part, not the other persons.)
Regardless - One time, somebody poked me on TS one day to check out a hacker - I go on the server to see him sprint hacking, going about sprint jumping speed or a tiny bit faster without sprint jumping. (Obvious sprint particles too, especially during combat.

) After I get enough evidence, somebody in the server tells me to check somebody else - sure enough, he's hacking too, but this was even better. He literally sprinted (at sprint jump speed.) in one direction while ever so slowly spinning around in a circle, eventually sprinting backwards for a full few seconds, looking as if he wanted to show off his hacks.

I saw him and the other hacker fight in the deathmatch, and it was just like watching two little sonics run around for 4 minutes before one finally won. That's when I realized the winners username was "sonic" and a few numbers. lolwut.
Needless to say, it was just absolutely hilarious to watch these two run around at top speed getting nothing done, more so than it should have been.
