Dierks Bentley has been known for taking ice baths before his concerts and wanted to share his love for cooling down by "asking" Travis Denning to jump in a trash can full of ice while interviewing him.
Since Travis is the tour opener, he probably felt like he had to say yes so he stripped down to his underwear and jumped in. Depending on how Travis answered Dierks' questions, he either got more ice dumped on him or shaved off some time from the interview.
Here's hoping Travis didn't get frostbite on any of his limbs while on the rocks.