Will Power giving his team-mate Josef Newgarden the middle finger, after Power was taken out of a vital race for the championship during a slow restart led by Newgarden, just about summed up Team Penske's controversial IndyCar season.

It's neither the first Penske team-mate clash this year nor the first race where it has been embroiled in controversy.

But even so, it generated a severe reaction, with some on social media even claiming preferential stewarding treatment - which likely stems from Penske's push to pass scandal earlier this season and an issue of interpretation regarding the 'separation of church and state' between Penske the team and Penske the series owner.

To understand what happened, why there was so much animosity and what might happen next between the team-mates, we’ve investigated things further.

Why Power was so mad at Newgarden

Power was taken out by Alexander Rossi on a late-race restart with nine laps to go, while he was running fourth and on course to take points out of Alex Palou's championship lead.

Having got out of the car, Power then flipped the bird at his team-mate, while Colton Herta - who avoided being caught up in the incident - called what Newgarden did "dirty".