The two-step is a tactic where a state trooper will pull an individual over for a traffic infraction and, after issuing a ticket, take steps back toward their vehicle. They will then turn around and initiate a new interaction with a driver, which the highway patrol classifies as a voluntary stop. [More]
If they’re not free to leave without getting double-tapped, it’s hardly voluntary.
[Via Steve T]
Don’t know the situation, but if he has finished and starts to leave, start your car and leave at once safely.
This is not unique to KS, seems to be common in TX as well and is practiced by all costumed road agents.