1. Spencer/Tash get the clue to the idol and find it.
2. Spencer/Tash win the immunity challenge.
3. Big alliance votes the person with the idol
4. Spencer/Tash vote Tony
5. Both normal idol/TP idol get played
0-0 vote. If dreams could come true ... I'd want to see this :D Alas, it is very unlikely lol.
The TP idol is separate and treated as 'special' I believe. There is always a normal idol in play. I believe it would be putting back in the one Spencer just used.