Reading the paragraph given to the students was very interesting. For context I'm much older, English is my second language, and it is very mediocre (but still much better than my generation average because of my work).

There were some words I didn't know either because of the cultural context (Michaelmas, lord chancellor, Lincoln's Inn Hall) or because of my limited English (the word mire for example). But in all cases I could infer enough meaning that I was able to read the paragraph without losing too much (except for Lincoln's Inn where I thought it was a literal inn but it's not very important for the understanding in the paragraph).

I would say I'm surprised that it was so hard for college students majoring in English but I also noticed that the young generation in my country has a big problem understanding figurative speech, worse than just a general lack of knowledge (it didn't help that it has been politically useful to pretend not to understand figure of speech for the last 15-20 years).