Playing through strikes today my fireteam ran across something strange. Playing the undying mind strike and at the end when the boss died the portal where all the ADDs come from opened up and showed a door/pathway behind it. Has anyone else seen this or ran across this or has this just happened to us? I haven't actually looked into this to see if there are other posts about it.
Edit: Tried going through the gate but there was an invisible barrier and not enough time before strike ended to try and get around it.