[Jason Jones]

The car in front has control of the racing position if you are direct behind him, and you shunt him, the be decent enought the give the position back?

I wasn't in the race but here's my two cents on the subject anyways. No one has an obligation to give the position back just like IRL. Points are deducted from contact, which typically negates the points gained by making the pass. If the contact is malicious then file a protest. Protests typically result in a ban for the offender which means you won't have to deal with them in the next race.