Relatively early on in the proceedings, Dalton flashes a grin at Jimmy while they square up after a flurry of blows and counters. Is he…enjoying this? Yes, at the moment anyway, and for several reasons. First, he’s just told Doc that he’s only good at one thing: He never loses. Of course he’s glad to be doing the one thing he’s good at.
Second, consider Jimmy’s rhetoric. He opens their battle banter with “Prepare to die.” Dalton knows he’s in a life-or-death struggle, for himself anyway—I don’t believe he has any plans to kill Jimmy at this stage—and with that in mind Dalton is pleased to have weathered Jimmy’s initial murderous assault with roughly the same alacrity as he’s fended off countless others. He’s doing well, and he knows it.
Third, and again springboarding off Jimmy’s declared intent to kill, Dalton knows that being as good as he is is pissing Jimmy off. He can read the frustration all over Jimmy’s face, and thanks to Marshall Teague’s enormously expressive mug, so can we. There’s some delight to be taken there, as any number of the smug smiles he’s shot at the Tinkers of the world indicate.
But we have another face to look at here, don’t we. Jimmy is not just annoyed, or even pissed—he’s furious. He decided to kill Dalton the moment Dalton knocked him off his motorbike, and he’s doubling down on that decision.
When Dalton realizes this, when Dalton decides it’s really kill or be killed, Dalton will smile no longer.