There you can see that one of the security is attacking the dude that has the terrorist pinned. This is the guy the cop tackles. That sadly allows the terrorist to get up and continue the attack.
Not getting hurt people out of reach but trying and failing to protect the hero that temporarily stopped the madman.
Amazingly it's not a total lie. There is a second video out: https://www.youtube.com/watch?v=imbUW7GcgUQ (german)
There you can see that one of the security is attacking the dude that has the terrorist pinned. This is the guy the cop tackles. That sadly allows the terrorist to get up and continue the attack.
Not getting hurt people out of reach but trying and failing to protect the hero that temporarily stopped the madman.