I guess the joke’s on this bird. He looks a bit abashed, like maybe he showed up at the party quite overdressed, (the ruffle was a bit much) and people looked and him and sniggered into their drinks and whispered behind his back. He wanted to make light of it, but ended up in the corner looking miserable. Oh dear.
Then in walks Wader Bird, regal and at ease, striking just the right note of casual elegance, and the others stop mid-sentence to admire.
But it really is a post game party and Linebacker Bird was in such a rush to come that he forgot to take off his helmet! Since he helped to win the game, no one will mind.