This is part of the Abyss of the Shrine Maiden DLC.
This video begins with a group of players planning a trap for someone, and covers helping Tia escape a trap from other players. Here are the timestamps and notes.
0:00 This video begins after getting all the Valenstar Deep Market Key's and reaching the second area of Valenstar Center. You meet a group of players who want to set a trap for an enemy. Kirito agrees to help. After this you will be in the second area of Valenstar Center.
1:34 This part of Valenstar Center take the south west exit.
1:40 In this new area of Valenstar Deep Market head to the north west exit for a scene.
1:45 You will get a scene of Kirito and group waiting to trap whoever the players were after. Of course its Tia. Tia escapes. A group of players will say she ran off to the north.
10:22 After the scene take the exit in the south west, just to get a teleport marker before returning to the story.
10:31At Oltado Cloister, grab the teleport marker. You will return here later. Teleport to The Pearly Expanse.
10:49 At The Pearly Expanse run to the east exit for a scene.
11:11 You will get a scene of players hunting Tia. Kirito and group try to use the high IQ concept of "NPC's have never dropped Items, why do you think this one will?" and they actually (surprisingly) listen to reason and leave. After the scene, take the east exit.
14:01 In the Cliffs of Leios you will get a scene with Tia. Kirito will have a 1 on 1 fight with her. After the scene, both Kirito and Tia will fall over the edge. You will start in a completely new area.
19:10 In this new area head west to the quest marker. for a boss fight.
20:39 You will have Tia help you in this boss fight.
21:32 After the fight Tia asks Kirito why hes helping her. After this scene continue to the exit.
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