In another lifetime I flew single seat Vampires and did air-to-air cine camera gunnery. One Vamp was the stooge, the other the attacker. After pressing the firing button for the camera shot, the attacker would bunt and pass directly under the stooge missing it by maybe 50 feet then break away. The stooge would sometimes complain of a jolt as the other Vampire passed close and directly underneath. The closer the miss, the more violent was the jolt, usually causing a "Hey wotchit!" from the stooge. I often exactly what caused the jolt. Any thoughts?