That's enough to prove to Strange that Shura was like him, that she died and came back as well. He pulls her in, ostensibly to continue the dance.

"I never said the shirt was new," he whispers, close into Shura's ear. All he did was make a joke about out of date fashion, not say any details of the new shirt he woke up in. The joke could have easily been about the clothes he died in, not the mysterious new tunic he had. He's not even bothering to conceal the excitement in his voice as he whispers, "You died as well, didn't you."

And before Shura can say anything else, Strange moves her into a spin to finish off the song: the music starts to die down as the rest of the couples finish the dance.