It's a famous final word. 

Gwaine is friends with all the other artists and he knows how to have a good time. Tristan gets the best seat in the best box, with a perfect view of the whole stage, and particularly Gwaine's stunning performance. 

He is the irreverent dashing hero, yearning for love and adventure and abandoning duty for it. A curse causes him to lose his way and question himself, and brings the hero low. 

Tristan has always thought of Gwaine as someone who had nothing in him but mirth, but the tragedy he plays out as the hero is astounding. Many of the audience are in tears. Jasmine has to hold Arthur's hand, explaining to him the intricacies of the art, but he is happy enough to have a reason to offer his shoulder.

At the end, the crowd roars its approval and its admiration for Gwaine, and he is called back two, three times to bow. 

He looks like a shining star on that stage, with all the lights on him. His final kiss he sends straight for Tristan, winking.