Hacker found - Video proof

[Bluffnix]

That's not what this is at all. The (banned) program these cheaters use allows you to fall through ALL scenery, no matter where you are. For example, they can stand BENEATH the floor in Alexander & hit the boss but nothing can hit them. They can walk through barriers, float high in the sky and other nefarious stuff.

This is a great example.
Think of it like flying in Diadem, where you can sac monsters and with a little bit of range hold them while flying.

Practiced in reverse, a whole entire team of ranged dps can in theory drop below the ground and clear it w/o ever taking any damage.