Call the Floor
"I've been playing poker for thirty years and that's never been called a string," Giang complained. With the hand already concluded, the dealer wasn't sure if Giang really wanted a floor. He replied that he did, so he could know for the future if his action was allowed.
We didn't see the betting motion that was called a string, but the dealer responded that Giang made two betting motions, apparently by backhandedly tossing chips across the betting line with both of his hands but not at the same time.
A floor was called but by the time he arrived at the table, Giang seemed unwilling to press the point.