This stuck out to me a lot and I wanted to see if anyone else had any thoughts on this.
The first image is from the recent teaser of the camera man going down into the hole from the trailer. This brightens image shows the lifeform. The part I circled red is what I think is the head. The part to the right of that which is the blue circle I think is the arm of the creature. On the head you can see two horns that come out on both sides
If you go to image two you can see the same head shape with the two arms/legs/whatever they are with the lifeform almost like reaching around the corner as to grab on and peek around. The circle on this one highlights the arm.
Then on the last image you can see the head shape again with the two arms or legs coming out of the head. To me this looks a lot like the lifeform sighted in motion detected from the way its two horns come out of the head and its arm reaching around the corner. When I first watched motion detected I thought it was an upside-down person almost with the two legs and the arm of the person grabbing on but after the teaser It definitely makes me think it's the same lifeform as seen in the teaser.
shout out to u/intelligent_two7486 for posting this image and u/dyrwx for posting the correlation between the lifeforms.