Dimension X - super slow-mo reveals Demo went there

I was watching S5 Episode 4 again, the scene in Turnbow Trap where the demo is running from the Beamer in the upside down. If you watch it in super slow-mo, you can actually see the "opening" the demo made (i'm guessing in the "wall") when he returned to Dimension X, followed by the 4 kids trapped there. It's very faint, but you can see the opening.