A.T. Robertson Commentary Matthew 26:71

"And when he was gone out into the porch, another [maid] saw him, and saith unto them that were there, This man also was with Jesus of Nazareth." — Matthew 26:71 (ASV)

Into the porch (εις τον πυλωνα). But Peter was not safe out here, for another maid recognized him and spoke of him as "this fellow" (ουτος) with a gesture to those out there.