The mental equivalent of fight/flight is submit/subvert. Your ability to be observant is what gives you the edge to stay calm in the face of chaos. When someone is trying to manipulate you emotionally they are creating chaos. Learn to subvert or you’ll submit.
Every sales thing I’ve talked about is taking you on the road from peddling commodities or trafficking in luxuries. The former is where you learn to sell. The latter? Profit.