The Lightning is a game mechanic in Five Nights at Wario's 2. Its purpose is to warn the player of an enemy's attack. When it happens, it seems to flicker the windows a bit.
The lightning is a new mechanic in Five Nights at Wario's 2. It appears to come from the storm outside. When it flashes, the player can check if there is an enemy in the hall of The Office. The player can also see Wario Man flash for a split second when the storm hits.