  Recently, a number of peculiar flares have been reported, which demonstrate
significant non-thermal particle signatures with a low, if any, thermal
emission, that implies close association of the observed emission with the
primary energy release/electron acceleration region. This paper presents a
flare that appears a "cold" one at the impulsive phase, while displaying a
delayed heating later on. Using HXR data from \kw, microwave observations by
SSRT, RSTN, NoRH and NoRP, context observations, and 3D modeling, we study the
energy release, particle acceleration and transport, and the relationships
between the nonthermal and thermal signatures. The flaring process is found to
involve interaction between a small and a big loop and the accelerated
particles divided in roughly equal numbers between them. Precipitation of the
electrons from the small loop produced only weak thermal response because the
loop volume was small, while the electrons trapped in the big loop lost most of
their energy in the coronal part of the loop, which resulted in the coronal
plasma heating but no or only weak chromospheric evaporation, and thus
unusually weak soft X-ray emission. Energy losses of fast electrons in the big
tenuous loop were slow resulting in the observed delay of the plasma heating.
We determined that the impulsively accelerated electron population had a beamed
angular distribution in the direction of electric force along the magnetic
field of the small loop. The accelerated particle transport in big loop was
primarily mediated by turbulent waves like in the other reported cold flares.
