It’s been awhile since I’ve read it, and I don’t have the book in front of me to refresh myself, but my initial answer would be that this is further showcasing Edmund’s fleshly rebellion to Aslan. The statue reminds him of Aslan, so he wants nothing to do with it. Perhaps also he’s fearful because he subconsciously realizes that what he’s doing is wrong. Like sneaking candy from the drawer and turning around to see your mom in the doorway.
I’m probably too late to this, but there’s my answer.
"Write the vision, and make it plain on tablets, that he may run who reads it."