  We present a detailed kinematical study and modeling of the emission of the
molecular cores at ambient velocities surrounding IRAS 21391+5802, an
intermediate-mass protostar embedded in IC 1396N. The high-density gas emission
is found in association with three dense cores associated with the YSOs BIMA 1,
BIMA 2, and BIMA 3. The CS (5-4) and CH3OH (5-4) emission around BIMA 1 has
been modeled by considering a spatially infinitely thin ring seen edge-on by
the observer. From the model we find that CS is detected over a wider radii
range than CH3OH. A bipolar outflow is detected in the CS (2-1) line centered
near BIMA 1. This outflow could be powered by a yet undetected YSO, BIMA 1W, or
alternatively could be part of the BIMA 1 molecular outflow. The CS and CH3OH
emission associated with the intermediate-mass protostar BIMA 2 is highly
perturbed by the bipolar outflow even at cloud velocities, confirming that the
protostar is in a very active stage of mass loss. For YSO BIMA 3 the lack of
outflow and of clear evidence of infall suggests that both outflow and infall
are weaker than in BIMA 1, and that BIMA 3 is probably a more evolved object.
