شب عاشورا، حمله به سخنرانی خاتمی در جماران

This is very disturbing video. Much of what is going on requires more context than I can provide. Here are my questions:
1. When/where does this video occur?
2. Translate please?
3. What is chanted just after the 2:05 mark?
4. What is chanted just after the 3:03 mark?
5. How did this much video of this quality make it out of Iran at this time?
6. (an odd question just for me) Why does the camera operator constantly and repeatedly go back to the the double doors with glass panes? This seems an odd preoccupation when the former Prime Minister is speaking and the remark are supposedly broken up by "thugs."