Dog did it.

Dog did

EDIT: I figured it out. The answer was the broken cup and the sound of Dread collapsing. I'm super slow.

Justin Lawson did it, just use the broken ivy as your secret passage way. :)

Your good as long as you notice the vines. When you notice them just go back to deductions and click the picture of Alfendi and go ahead to the conclusion the whole "secret passageway" is just the culprit crossing the vines

I know there is a vine on the central tower that's been like pulled on.. But I'm currently stuck on that too