sometimes you get matched with people, who already closed battle screen before hours. there could be a timeout check, so that only users who are active on battle page get matched. when you close battle screen it should delete the entry in firebase also in case you leave a Battle, because opponent is not online and not responding, you loose the coins that was deducted when you joined battle. that's a bug, because opponent that got matched not online and not playing, so you have to leave game
