Without being able to listen to the NASCAR radios I can't say for sure.
A bunch of possibilites.
No contact with other cars.
First incident, drivers or crews may have had a problem with the sort out afterwards and said something.
Can't see the whole track, what went on behind the spin I don't know.
Been awfully consistent since then with the yellow. Something must have triggered the response.
Can't see how Rudd would be a target to lose a lap nor Geoff to be a benefactor not to lose one.
Real hard to watch TV and know what is going on off screen