{X Y : AlgebraicGeometry.Scheme} →
  {f : X ⟶ Y} →
    {motive : AlgebraicGeometry.IsLocalIso f → Sort u_1} →
      (t : AlgebraicGeometry.IsLocalIso f) →
        ((exists_isOpenImmersion :
              ∀ (x : ↥X), ∃ U, x ∈ U ∧ AlgebraicGeometry.IsOpenImmersion (CategoryTheory.CategoryStruct.comp U.ι f)) →
            motive ⋯) →
          motive t