Here's 2 questions that came up while playing that scenario.
1. The quest's 1B says 'Progress cannot be placed on this stage unless Helm of the Stormcaller is in the victory display.' What's the timing on quest resolution and explored locations leaving play ? i.e. what happens when the players quest successfully with Helm of the Stormcaller as the active location (assuming there's more progress then necessary to clear it)? Is it
A) You place enough progress tokens to clear Helm of the Stormcaller to explore it. It goes to the victory display, allowing you to place what left of your progress on 1B.
or
B) You place enough progress tokens to clear Helm of the Stormcaller to explore it. You would put the rest on the quest as normal but the text on 1B prevents you to do it. Now that placing progress tokens is done, Helm of the Stormcaller is explored and goes to the victory display, allowing you to place progress on 1B only next round.
2. The rules of the scenario tell us that grappling tentacles are detached and added to the staging area when the attached location becomes the active location or it is explored. What happens when grappled locations leave the staging area in some other way (for example, with Mariner's Compass) ? I'm guessing the tentacles are also detached and added to the staging area, but it isn't clear imo.