[This close, the differences are even starker, dead-white skin and red eyes in a hollow version of Billy's face, and then it tries to touch him and he lashes out without even thinking about it.]

Don't touch me!

[His blow isn't that strong. The angle is a little wrong for that, made awkward by how stupidly close he'd let the fake Billy get, and besides, he isn't trying to kill it. Not yet, at least, even if it would be so easy to just crush it now it's down.]

One last chance to just leave, before this becomes a fight. I'm not being used as bait ever again.

[He looks up at the crowd of blank-faced adults.]

If you want Billy, you're going to have to get him yourself.