Shooting out of cube with enemy inside

Just looking for clarification. If an enemy advanced in to a cube with my model and completes its assault without killing me, can I shoot out of the cube at other enemies. The rule book states 'The Shoot action cannot be taken if the Active model is in the same cube as an enemy model' which reads as a no but does it intend to be you can't shoot at the model in the same cube or you just can't shoot at all.