When American artist Logic introduced interpreter Kat to the crowd at New York's Governors Ball Music Festival, he challenged her to keep up with his freestyle.
"I'm going to freestyle and we're going to see if you can keep up with my raps," he said.
And judging by the reaction in the crowd - she did just that.
"Everybody this is Kat, she is signing for the hearing impaired today, this is incredible," the 27-year-old rapper told his fans.
"I want to have some fun today are you ready?" he added before starting his freestyle.
