A way I repeated odd online play with the help of Xandu, I think it was his room and I let him start the race when the 'green start the race together option' came up.
We were both Cops and doing a Hot Pursuit on the 'Jump' bridge King Fisher Road (Hard) Fight It Out. When the race started off I waited while Xandu chased cars to takedown/bust.
On the first race all the race cars stayed at the Start line so i stayed and took them down while Xandu was racing after 'other racers in his 'game''' but what damage he did to the car and I did to the ones I had would happen in real time, even though my cars were stationary.
So his cars would run over his Spike Strips I would see the damage done to my stationary cars. If they boosted I could see the flames, though they were going nowhere.
Xandu was doing the hard work chasing mind.
One the 2nd race set up, some cars raced off but one drove back for me to takedown 4 racers, stationary, while Xandu killed his racers 'in motion'.
Third try, 2 stayed behind and the other 3 raced off, I took down my 2 and raced off to help Xandu, and we again completed the race 3 times but with odd events happening.
Sort of fun but not the disired results.
I hope this helps or Xandu may have to translate, lol