Looked to me like the video-recorder guy may have seen the shower of sparks, grabbed his phone and started recording and maybe slowed down to get a better look.The questions to ask are:
Why was someone recording video at that moment? Was this staged?
Was this a wrecked vehicle someone was doing a stunt with?
I think I would have changed lanes and got out of the way if I saw this coming... who knows what would fly off and hit me....