"Exercise doesn't do a thing when the other person cheats," Strange points out the obvious. Birds have wings buddy, what the hell could he do then? Still, two can play at the dumb shapeshifting game.

With a wry smile on his face, Strange turns into smoke. The purple smoke lingers where he stood for a moment before trailing over towards Childermass (and Lambert by proxy). Strange doesn't really have a plan here. Get in Childermass's face? Make him cough so he drops the paper? Can birds even cough to begin with? All he knows is that smoke in Childermass's face will be annoying, ergo that's what Strange will do: try to float around Childermass's bird face in an annoying manner.

Pity he's forgotten that he's slightly poisonous. Thanks, alcohol.