∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] [inst_1 : CategoryTheory.Limits.HasZeroMorphisms C]
  {S₁ S₂ : CategoryTheory.ShortComplex C} (φ : S₁ ⟶ S₂) {W' : C} (x : W' ⟶ S₁.X₂),
  CategoryTheory.CategoryStruct.comp x S₁.g = 0 →
    CategoryTheory.CategoryStruct.comp (CategoryTheory.CategoryStruct.comp x φ.τ₂) S₂.g = 0