I've watched this movie hundreds of times and for decades this has always bothered me. When the tall alien comes out, he raises his hands, everything is cool, and then he disappears.
There's nothing to suggest that these beings have anything we'd consider magic, or teleportation (hence Barry's abduction). So, was this an editing glitch or something? I can't imagine Spielberg letting that get past him, especially after the Director's Cut.
The only other part "wrong" with that scene is that when the alien comes out (he's like 30 feet tall), the team leader is looking down.
Any ideas on this? Editing glitch? Something to "just accept"?