The apodosis (qu'est-ce que je ferais) is omitted and only the protasis is expressed.
It is a protasis of the complex order, as M. Lysidas used to say.
Here we regularly have the Indicative in both protasis and Apodosis.
The hank time-taking to a hinge one (protasis):—If ye ask (hinge), ye shall receive (hank).
The protasis takes those tenses of the Subjunctive demanded by the sequence of tenses.
The protasis takes those tenses of the Subjunctive which are required by the Sequence of Tenses.
The protasis in Conditional Sentences of this type always remains unchanged.
It went off, as G. assured M., exactly as the opening act of a piece—the protasis—should do.
Positing what protasis would the contraction for such several schemes become a natural and necessary apodosis?