Give this law student a million dollars.

A contracts case for your delectation:

During the course of the ["Dateline"] interview, [James] Mason said it was impossible for Serrano to have committed the murders, since it would have required his client to fly from Orlando to Atlanta, exit one of the busiest airports in the world, and arrive at a hotel five miles away in less than a half hour.

"I challenge anybody to show me, I'll pay them a million dollars if they can do it," said Mason on the show....

Dustin Kolodziej, an enterprising law student at South Texas College of Law, decided to take up Mason's challenge. In December, 2007, Kolodziej retraced Serrano's alleged route and made a video recording of the travel. He made the Orlando-to-Atlanta-hotel trip in under 28 minutes.

... Was Mason's "Dateline" exclamation a rhetorical flurry or an actual offer that created an implied oral contract when Kolodziej accepted?