How do you afk as nassus, but at the same time, not let the game get out of controle?

Nasus has an ability on the Q slot of the keyboard that has a fast cooldown.

Good teleports, simply as that

you trust your teammates won't feed like crazy? put some pressure in lane if you don't see the enemy top laner, threaten to take their turrets and take back away and take their/your jungle camps when someone comes