system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] In the 1st Avengers film they use Loki’s staff to access the Tesseract and close the portal, saying you can’t protect against yourself’. But the staff had the Mind stone, the tesseract was the Space Stone.

so what happened?  Could the Time Stone have also penetrated the energy barrier and close the portal?
gpt
Erik Selvig says "Loki's sceptre. The energy. The Tesseract can't fight, but you can't protect against yourself." Since Black Widow replies "It's not your fault. You didn't know what you were doing," Selvig seems to be speaking in the context of being mind-controlled.

Selvig had rigged the Tesseract-operated portal device to respond to the sceptre - possibly its energy signature - in order to shut it down. He couldn't have known about the stones, because the sceptre was only revealed to have something in it after substantial analysis - that, and Ultron removing it from inside, and all of that wouldn't take place for another few years.