This one was done to be noticed on purpose for what it was, especially in the age of social media and how these chilling accounts are going viral.
This was a "5th of November" occult sacrifice to be remembered, but also a big revelation of the method to the masses.
I don't like it. Means something bigger could be imminent. Stay vigilant. I would absolutely steer clear of events like this.
This sounds like a creative version of the Boston Marathon bombing for me.