Eren and Wendy have their dragon powers and Rinku can turn into a small bird, so they're going to check out the rickety left path. They're staying on foot so far, but Wendy will give the group an agility buff and they'll try to get into the air as soon as it feels like the path is about to collapse.

(In the event that it does, since flying straight up didn't work, they'll try to see if flying along/over the staircase works, as it's still following the stairs.)