(NewsNation) —  A veteran crime scene recreation expert who’s analyzed the video that purports to show two creatures in a Las Vegas backyard says the video hasn’t been altered, and he believes he sees the images of not one but two beings.

“Once you see it, you can’t deny it,” said Scott Roder of “Evidence Room” Animation and Exhibits.

“There’s no editing. That is an original video,” he told NewsNation’s “Banfield” on Friday. “We tried to debunk it to see if there was something that was added to the video. All of our results came back as it was authentic.”

It was April 30, 2023 when the Kenmore family called 911 to report something “not human” in their backyard. Police investigated in part because other officers had spotted a mysterious flashing light in the sky that same evening.

But proving the video hasn’t been altered doesn’t confirm what it shows. And Roder says it took a lot of views before he spotted something that he initially missed: two beings in the video at the same time.  

Roder used motion tracking software, which also pinpoints the source of the motion.

“We took the vector motion — points in space … and then we attach that to a figure in the background to show that the movement of the shadow reflects the movement of a body that is attached to the head.”

“We don’t believe it’s a floating head,” he added. “We believe it’s attached to a body. And the motion of that head from right to left is consistent with the motion that we see between the slats of the fence.”

“It’s there. It’s absolutely there.”

Adding to his belief: the reaction of the Kenmore family, all of whom appear to be genuinely startled by what they saw.

Ben Hansen, the host of “UFO Witness” on Discovery+, isn’t so sure. He agrees with a digital expert in the U.K. who believes the “creature” is really a shadow cast by a flashlight held by a Kenmore family member.

“I’m convinced it’s explainable,” Hansen said.

But Roder says that’s not how shadows work. He says the image appearing above the fence doesn’t have a surface to show a shadow.

“I don’t understand how the shadow could just be floating above the fence. I don’t believe that makes any sense.”

Roder say if debunkers believe it’s a shadow caused by a light source, they need to replicate it. If that happens, then he’ll consider the validity.