It's often just a part of racing. Drivers from mild-mannered Jeff Gordon to ladylike Danica Patrick have erupted in anger on the track at another driver. The confrontations are part of the sport's allure: Fans love it and cheer wildly from the stands. Stewart, who has a reputation for being a hothead nicknamed "Smoke," once wound up like a pitcher and tossed his helmet like a fastball at Matt Kenseth's windshield.
"I've seen it many times in NASCAR, where a driver will confront the other one, and a lot of times they'll try to speed past them. And that's what it appeared to me as if what Tony Stewart did, he tried to speed past Ward," witness Michael Messerly said. "And the next thing I could see, I didn't see Ward any more. It just seemed like he was suddenly gone."
The crash also raised questions about whether Stewart will continue with his hobby of racing on small tracks on the side of the big-money NASCAR races. He has long defended his participation in racing on tracks like the one where the crash happened, even as accidents and injury have put his day job in NASCAR at risk.
Saturday's crash came almost exactly a year after Stewart suffered a compound fracture to his right leg in a sprint car race in Iowa. The injury cost him the second half of the NASCAR season and sidelined him during NASCAR's important Chase for the Sprint Cup Championship. Stewart only returned to sprint track racing last month.
The crash site is the same track where Stewart was involved in a July 2013 accident that seriously injured a 19-year-old driver. He later took responsibility for his car making contact with another and triggering the 15-car accident that left Alysha Ruggles with a compression fracture in her back.
"Everybody has hobbies," he said last month, adding that "there are a lot of other things I could be doing that are a lot more dangerous and a lot bigger waste of time with my time off do than doing that."
Greg Zipadelli, competition director for Stewart-Haas Racing, said Stewart felt strongly he should not race after the wreck. Regan Smith replaced him in his car.
"We're racing with heavy hearts," Smith said.
AP Auto Racing Writer Jenna Fryer, AP Sports Writer John Kekis and AP Writer David Klepper contributed to this report. Gelston reported from Philadelphia.
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