What is your obsession with not being questioned that it must be arguing on my part?
Moving on:
In the video captured from the Knott's incident, the metal pieces came directly at the riders.
Even in the TTD incident, the metal shards came directly at the riders.
In this video, they clearly do not as the pieces are off to the side of the train.
To me: the objects in question are simply pieces of safety glasses and other debris that fell off a previous rider that were hit by the train itself.
And most importantly: If they were metal pieces, wouldn't the ride would be shut down as a safety precaution?