How can I make progress on the "stick it to ya" challenge?
The challenge is to kill 15 enemies by using boarder spikes. I somehow have nine, though I'm not sure when or how I got them. Enemies never seem to land on the spikes when they try to jump on my car. I've also tried "nudging" them with the spikes, but it doesn't seem to count.
A bit of googling suggests that I need to find a vehicle full of boarders and kill them as they try to jump to my car, but I haven't been able to find any. I've finished everything else in the game besides a handful of combat challenges, so vehicles don't spawn very often in general.
What can I do to finish this challenge?
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Mad Max - Stick it to Ya Challenge! (Day or Night, After Ending the Game, Post Completion)
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