We report the observation of anomalous conical emission in the first resonant transition of atomic calcium in the presence of a second probe beam. The observations do not favor the refraction-at-boundary model unless the incoherence between the beams plays a crucial role. On the other hand, an induced defocusing of a blue-shifted beam takes place in the presence of a strong red-shifted beam. This result is rather surprising, since it is observed under circumstances where self-focusing would be expected.