what happened to ZF around 12:36pm?

I was watching ZF today, and around 12:36pm there was a heck of a down move. In general, I pay attention to Econoday for various reports/news that should keep me OUT of wild market moves, e.g Fed announcements etc... but I didn't see anything on their calendar to be wary of here. Anyone have an idea of what news/event might have triggered that? Or what other stuff I should be paying attention to besides what is on the Econoday calendar to keep out of wild market moves?

Thanks!