Only by what she says next does Henry realize this isn't the Regina he knows who's here. Two things cross his mind: One, is Regina still here, and two...what the hell is happening in Storybrooke? All that passes on his face is confusion as he takes one very large step backward.

"Why would Emma try to get rid of you? What's happening? Why are you acting like this, and why are you dressed like the Evil Queen?" he demands, not afraid, but worried now, for everyone he loves including Regina. Something happened to make her evil again, it had to, he just doesn't know what.