Sounds good on the surface but the edit of the alien in the corridor doung that squat move is part of the Ripley trying to blow the alien out the airlock the first time and was an unfinished sequence…
The footage of the Alien squatting in the corridor (Box Alien?) is an outtake from this (later) sequence: Ripley heads towards the shuttle (after setting the self-destruct), bumping into the creature, she drops the container carrying Jones and rushes back to engineering, to stop the 10 mins countdown.
It’s not from the earlier deleted scene where Parker, Ripley & Lambert almost succeed in trapping the Alien in the air lock - which ends with Ripley’s nosebleed.