Priya Ghosh ’09 sends in footage from Thursday night. You can see the pepper-gas-ball gun in action at 1:52-2:10ish, firing in a semicircle. Also, the K9 Units are visible though their actions are somewhat obscured by the lighting. This all took place approx 35 minutes after the arrival of cruisers, and some time after the initial volley of teargas and pepper-gas-ball things.
Everyone keep in mind that there are still A LOT OF QUESTIONS ABOUT WHAT WENT ON.