Ectoplasm Wings Ghost Picture

David sent us this ghost picture of what appears to be ectoplasm. Could it be a bat? Here's his thoughts...

"This picture was taken this past 4th of July. The show had not started yet, so I ruled out smoke. If you look above the head of the second guy to the left, you can see what looks like a huge bat. You can see his mouth open like it's screaming. Wings stretched out...I've had the picture (for a while), but never knew there was somewhere to post something like this. What do you think?"