Shares in Best Buy had already fallen earlier on Thursday, after The Star Tribune of Minneapolis reported that the company's founder had moved on to trying for a minority stake in the retailer.
Stocks fell early on Thursday on news of the London bombings, which killed scores of people and injured hundreds.
He won his first 1,000 of the season after his opponent, Jan Bos of the Netherlands, fell early on.
When Restless Harry fell early on the second circuit and brought down Won In The Dark, followed by the fall of Smad Place, his task was made easier, should he have needed it.
Mosul fell early on Tuesday after four days of advances by the Islamic State of Iraq in Syria (Isis) and rapid capitulation by the Iraqi military, whose members reportedly abandoned their posts as the jihadists advanced.
However, when Austria's Andreas Zehrer fell early on there was clear concern, with thoughts drifting back to Rome in 1960 when 35 of the 73 starters failed to complete the cross-country course and two horses were killed.
There is raw potential in the race, too, in the shape of Beef Or Salmon, who fell early on when second-favourite for the race last year, and a battle-hardened veteran, France's First Gold, also a former King George winner.
Stocks in Asia mostly fell early on Tuesday.
Defending champion Chris Froome fell early on but recovered to finish in the peloton as Kittel won his third stage.
Microsoft's stock fell early on but regained its footing after a couple of hours and was holding up surprisingly by midday.
