When it does, you'll see everything paused in time, with a slowly declining blue bar at the bottom of your screen. Wait mode is triggered if you enable it from the options menu, and are not currently attacking or moving. It essentially pauses the combat for a few moments, allowing you to scan enemies, switch between weapons and spells, and take stock of everyone's health. If you find the battle system works a little bit too fast for you, or you're dealing with a particularly nasty group of enemies, then it's worth investigating wait mode. One of the brand new features of the battle system is Wait Mode.