Sato was upset with Bourdais passing him on one final lap, but with Spencer Pigot immediately behind Bourdais, he was trying to open a gap to get a fast lap.
As the field went out to complete one final “flyer” Bourdais passed Sato, as if he were intending to improve position.
“I passed him on the out-lap, and it pissed him off,” Bourdais told NBC Sports.
Bourdais: “He pretty much ruined our race in Texas from three laps down and blocked us the last three stints.”
Vasser: “In this case, Sato was in his face in his box right after climbing out of his car.”

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