  We describe an Azumaya algebra on the resolution of singularities of the
double cover of a plane ramified along a nodal sextic associated to a non
generic cubic fourfold containing a plane. We show that the derived category of
such a resolution, twisted by the Azumaya algebra, is equivalent to the
Kuznetsov component in the semiorthogonal decomposition of the derived category
of the cubic fourfold.
