Ingrid walked through the secret passage and found that there were orcs there. In the fight that followed, she got knocked down and nearly died. The party had to hunker down for the night, after Alagosanu fried one last orc hiding in a different secret passageway.
In the morning, it took them nearly a full hour of head-scratching wonderment to puzzle out a way to get across the frayed rope bridge. But eventually they did so.