When pausing the game (in offline mode) it should pause mob movement and attacks

except they can attack you and kill you while paused.

To reproduce:

Find a place with mobs, and press pause, notice the red attack in the outside of the screen.

Extra Note:
This might not be a bug, but it would be nice if when you paused the game in offline mode, it would pause everything. (Like in normal Minecraft singleplayer)