English Standard Version
And he went out and followed him. He did not know that what was being done by the angel was real, but thought he was seeing a vision.New International Version
Peter followed him out of the prison, but he had no idea that what the angel was doing was really happening; he thought he was seeing a vision.Catholic Public Domain Version
And going out, he followed him. And he did not know this truth: that this was being done by an Angel. For he thought that he was seeing a vision