I had asked for the trap door mechanism in case of ficus but you have provided me the answer of salvia which is altogether a different mechanism?

Yes Sehar your correct.
I thought of illustarting you the same with an image, so that you understand.
1.Yes once the anther gives pollen and withers,
2.then the stigma becomes extended to receive the polen in the same flower.

The above two stages in an ficus flower are compulsory and sequential.

With out the sequence or the absence of first the pollination is incomplete.
Good work sehar