Here is the dialogue between the poll worker and the person filming:
"Challenge for residency."
"What's the basis for the challenge?"
'What's the specific reason?"
"Residency. That's the only answer you get... That's all I'm going to tell you."
Even more disturbing footage comes later in the clip when the poll worker is again asked the basis for challenging the student's residency. The worker walks calmly up to the camera and suddenly smacks it away.