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We show that all long nulls in PSR B0818-13 are trains of rapidly alternatingnulls and pulses (each shorter than one pulse period). Sometimes only the nullscoincide with our pulse window, resulting in one of the apparently long nullsseen occasionally. We show these are seen as often as expected if during such atrain the probability for nulls is 1.2 times less than for pulses.  During nulls, the subpulse drift-speed appears to increase. We assume thatthe carousel of sparks that possibly underlies the subpulses actually slowsdown, as it does in similar pulsars like PSR B0809+74, and conclude that thesubpulse-drift in this pulsar must be aliased. The carousel must then rotate in30 seconds or less, making it the fastest found to date.

Intermittent nulls in PSR B0818-13, and the subpulse-drift alias mode