There is a incredibly annoying glitch where everyone (except you) including monsters walks off the place, and your sprites just stand there, doing nothing, except looking around. And the game goes on around you, while you don't have a clue what is happening! The only way to survive is keep up your shield and move around a lot, but you have to be careful! Your shield might break without you realizing!
Sorry, was just reminded that what I said was a lag, not a bug Sorry ;P