Twins Duplication/Invulnerability Bug

If the player warps away during the Twins fight as it becomes day, and then returns to the area where the Twins are spawned, the Twins will fly away, but their shadows will not disappear.

If the player reconnects, the Twins will become active at any time of day, but invulnerable to all damage. (They will also have visual effects as though they were in water) 

If the Terrarium is activated a new set of Twins will spawn as normal, allowing for four Twins at once two of which are invincible.