Jump Related Accident at Deland, FL

I remember this accident being discussed here a while back and if I'm really
late to the party on this (the probable cause, that is) sorry...

Just noticed this paragraph in a recent AvFlash from AvWeb:

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Pilot William Buchmann and skydiver Albert Wing were known to indulge in
games of "chicken," local police have told the FAA. Wing was killed in
April when Buchmann, who was flying the jump plane, collided with him near
the Deland, Fla., airport. Buchmann's certificate was revoked by the FAA
in August. The FAA said he flew in a "grossly careless or reckless
manner," knowingly flying beneath the open parachutes of skydivers. "Such
conduct reflects an airman who is either unwilling or unable to comply
with basic regulatory requirements governing flight operations," said the
FAA. Buchmann has appealed the revocation, and local skydivers and pilots
have told reporters that Buchmann was not reckless and that Wing's death
was an accident. "Bill Buchmann has the overwhelming support of the
aviation and parachute communities. We have had literally hundreds of
letters of support," Buchmann's lawyer, Patrick Phillips, told The
Sun-Sentinel. According to the NTSB, the de Havilland DHC-6 was about
13,500 feet above ground level when 14 parachutists were released for the
skydive over the Deland airport. Wing was descending toward the center of
the field and was at about 600 feet AGL when the airplane, which was on a
left downwind approach for Runway 30, collided with him.

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Jay B