When a Warper teleports away, where does it go? To another location in the game? To an inaccessible location? Or does it leave the game entirely until it's time for it to warp back in?
It depends on why it teleports to. If the Warper is dealt enough damage to "kill" it, it will warp away (and despawn) instead of leaving a corpse.
Conversely, if the Warper is merely patrolling (has not noticed the player, or they are being actively ignored), it warps back to a spawn point (whereupon it will resume patrolling again).