On a dedicated server, game time does not stop when the client menu opens. In singleplayer (integrated server) opening the menu pauses the world.
If more than 200 milliseconds pass between ticks, the system shifts every gameplay timestamp by the pause length: player cooldowns, stuns, silence, DoT, possessed timers, Duelist dash, delayed Soul Sceptre effects, Illusionist blinks and illusion lifetime.
The client HUD uses the same adjusted clock, so cooldown bars do not burn down during pause.
