Watch this video, but do yourself a favor and pause at the 30 second mark. What would you do, and why? What cues do you pick up and what do they tell you?
Hopefully, you'd do something very similar to what the driver did here. No lights, not even hazards, a couple traffic cones, no reflective wear on the goblin. You should be saying "this looks sketchy as %&^#" and getting out of dodge.
Thankfully this one has a relatively happy ending. Two guys getting picked up strongly suggests the other goblin was ready to hop the center divider and carjack the driver while his partner distracted him on the passenger side.