This is no bug, it is intended that it goes in the ranged depletion pile after copying a ranged attack. For that turn it is completely acting as the card it copies.
This is a bug. It has been stated by TheRider that once depleted, this card is supposed to behave as if it were the original card (so that you can’t get recurring threats from it). Even if this card were a special exception, it should go into ranged deplete instead of banish. This makes a difference because cards are much easier to get out of range deplete than they are to get out of banish.
