effective manner that we witnessed
Did we really witness? What did we witness? Because I haven't seen a single video of a bullet hitting a person and this is one of the places in the world with the most cameras, not to count all the phones from the thousands of people in the concert. We were GIVEN 3-5 photos of bloody people on the ground and 2-3 videos of people being carried away, but we are talking about hundreds injured...how come we didn't see this?
Why were nearly all of the exits out of the concert venue completely blocked?
You really think some fencing or security staff can stop a crowd of thousands that is running from bullets? If you just got through seeing someone getting shot and keep hearing the bullets fly, is there anything that can really stop you from leaving?
I totally agree - sure I wasn't there - but from the video material I have inspected, which is a lot, there is no clear evidence of a single injured person. To the contrary people seem to be just scared of the sound. No one is falling in a "permanent" way, meaning staying on the ground for a longer time. This is topped by people yelling "Come on pussy" and stuff, which may either result from being very, very drunk or being conscious of the situation going on... There is this video about the guy being very calm about the situation, stating: "These are no real gunshots..."
Some of this is contained in here:
http://www.dailymotion.com/video/x6327nu