As super-rookie and Minardi Team USA driver Robert Doornbos slid his car into the rear of Sebastien Bourdais' Newman/Haas/Lanigan machine in the closing stages of the Toronto race earlier this month, most onlookers were thinking in terms of the bad blood that had flowed between them just a week earlier at Mont-Tremblant.
There, Bourdais, fuming at Doornbos' blocking tactics, had unwisely launched into a tirade against his rival, eliciting jeers from the Quebecois crowd.
Then, he refused to shake the Dutchman's hand on the podium. A week on, everyone wondered what might occur when the pair of them came face to face in the pitlane after a true on-track clash...