I think the danger zone thing is saying if it drops to $18,500 then at this point the bottom will fall out and it will drop a lot further. If it doesn't drop b

I think the danger zone thing is saying if it drops to $18,500 then at this point the bottom will fall out and it will drop a lot further. If it doesn't drop below $18,500 there could still be danger. Of course danger means it will then drop, well, you know ... below $18,500!