First you're all confident thinking black holes just sit there menacingly in space. Then you learn these cosmic vacuum cleaners can zoom through the universe near light speed AND they're invisible? That's not a space fact, that's a horror movie plot!
The universe really said "I'm gonna put inescapable gravity wells on wheels and make them invisible." Talk about cosmic jump scares! No wonder the guy's running for his life - can't exactly dodge what you can't see coming at relativistic speeds.