A similar situation: Twin Cessna gets landing-gear trouble after landing and is unable to steer off the runway, little C152 on short final behind is told to "go around" but does not answer. Controller gets nearly mad and is almost shouting "go around there is a twin Cessna on the runway. No Reply. Pilot lands on the numbers, taxies around the stranded twin and off the runway.. .He went around it!!!. .Controller stuck by heart attack, probably.