I'm only making an assumption here. Husband (Skyline) and Wife (4WD) are talking on the phone. Wife tells Husband someone just rear ended me. She pulls over. Dash cam continues to drive off because person in 4WD is a f**king idiot.
Husband thinks dash cam is trying to do a runner so he blocks them and tried to take a photo.
I dunno, to me it did look dodgy. But it's possible he was just trying to record their rego.