Corrected entry: At the end of the episode The Nox take the stargate to Earth in order to "recue" the Tolen. They then leave before the gate closes. This is a continuity error, as the gate would have needed to be opened on Earth again in order to leave.
zwegan
29th Jul 2009
Correction: The wormhole does close behind Lya after she comes through. She then reopens the gate (without the typical "kawoosh") and leads the Tollan through.