  The Osp(2|2) current algebra at level k=-2 is known to describe the IR fixed
point of 2D Dirac fermions, subject to a random SU(2) gauge potential. We show
that this theory has a simple free-field representation in terms of a compact,
and a non-compact free scalar field, as well as a free fermionic ghost, at
c=-2. The fermionic twist fields are crucial for the construction. The
logarithmic current-algebra primary field with vanishing scaling dimension,
transforming in an indecomposable representation, appears as a consequence of
familiar logarithmic operators at c=-2.
