If there is Skarner in both team, his passive's subject would automatically disappear from whole game.
1. Enter normal blind pick in summoner's Rift
2. Pick up Skarners
3. Hope there will be Skarners in other team
4. Then you saw the point: Spires disappeared.
Please Riot, I thought you tested that kind of situation already. When there is a Champion-Brought-Map-Mechanic in this game, you should think about this situation in the first place and make sure there won't be any problem.
Riot, you are making players who loves Skarner really really disappointing.
Please FIX it as quick as possible.