First of all this thing sits a whopping 657 MILLION Light years away, not miles LIGHT YEARS blazars are nothing unique. Closest One sits 400 million light away. While we can see their jets, the matter itself only reaches hundreds or thousands of light-years. Even if one happened in Sagittarius A* (can't for at least 5 billion years) the closest SMBH to us. We wouldn't die. What's so unique about this specific blazar is the fact it changed direction in the first place, nothing to do with the fact it's a blazar