To add some background: my students are high school freshmen, age 14-15, and they have English twice a week, once with me and once with their Chilean teacher. After sophomore year, they only have it once a week. Also, the entire curso of 45 students has every class together: there is no grouping by level, so the few students who actually understand some English are in the same class with kids who understand nothing. None of them, no matter their level of comprehension, can converse.
That actually sounds grimmer than the experience usually felt, but I think that (a) I quickly became desensitized as a matter of maintaining my sanity, and (b) the students learned to continue their accustomed behavior only when I wasn't looking, so I only saw one facet of the classroom, which showed me a reasonable fascimile of classroom flow.
The classroom videos Anna took on her second visit, in August, are on YouTube and below.