Broward Country Helicopter Footage -Update

Just ran across this and thought share in the time line of things. Best I can say, since the footage has no tags is to use the shadows and find a approx time line of when this fits. BEFORE everything, DURING.. or AFTER?
What do you think?

• Category: False Flag / Hoax ,Florida Parkland Shooting 2018,Wake up people
• Duration: 02:54
• Date:  2018-03-01 09:15:54
• Tags:   florida, school, shooting, helicopter, broward, country, footage