I think the big difference is with walls on the temporary courses, something that happens more in the U.S.-based IndyCar series than other series, maybe. Pantano used his car to set a "pick" on Bourdais, with the wall looming ahead. And Bourdais was faster - he was able to come off the previous corner much stronger, and get alongside. There's aggressive,m and then there's just... dirty. That seemed like what Will Power said about Dario - "he always races me dirty".
And I think Bourdais would agree