The Almighty Thor quest wont finish

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Wingedpug
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Viking Warrior
Joined: 03/15/2016

The quest objective tells me to go talk to Snotlout, the arrow points me towards the crack in the school wall, but when i fly into the crack it tells me to turn round and go back, the arrow just ends up making me fly from one end of the wall tunnel to the other, clearing my unity cache and brower doesnt do anything.