As far as meeting places in the castle, especially for a homework meeting, there were about a million that came to mind before this particular patch of hallway. But Mo had done calculations in regards to the halfway point between the Ravenclaw and Hufflepuff common rooms and based on step count and staircases, he figured this was pretty close.

And when one was convincing a stubborn Hufflepuff to meet them, logic was the best defense. So Mo waited. Not patiently, but he waited with most of his body tucked under the tapestry as he explored the wall underneath.