The collision-induced emission from perturbed NO(B (2)Pi/a (4)Pi) ("gateway") levels, previously studied by us using a beam/target gas cell configuration, was re-examined by crossing the NO(a (4)Pi) beam with a target gas jet. Moving the observation point along the primary beam, spatially resolved NO(B, v = 0 and 3) gateway emission profiles were recorded. Two types of measurements were made: (a) Applying a magnetic field at the collision zone, the B, v = 0 emission was quenched within the field, but reappeared at the field exit. This "freezing" confirms the mechanism of the gateway quenching as formulated earlier. (b) In the absence of a magnetic field, anomalously long radiative lifetimes were determined from both the v = 0 and v = 3 emission profiles. This direct observation of the long-lived eigenstate resulting from the perturbation is consistent with earlier measurements on the other, short-lived component.