Now, this is my 3rd favorite event. It is challenging. But I have a tactic that I keep secret. I'm willing to tell you guys.
Steps
•Get 500$ from any job.
•Buy HW's shield.
•Join Classic Killers.
•Try to stay away from baddies.

Now, you may think this thread is pointless, that's when I tell you you're wrong. The HW Shield reduces damage by 50%. It works in classic killers. You usually take 5-6 damage, but you take 3 or 2 instead. It's pretty useful. Don't try to help in anyway, it may feel dirty, but it doesn't. It's their fault they try to stay and die. What I recommend to do is to run cross and corners. Meaning run from corner and cross to corners. It helps. I've tried this several times, it helps. Hopefully this thread will help you win. good luck!