Unfortunately starvation mode is a misunderstood concept. I may go so far as to call it a myth. Author and nutrition expert Lyle McDonald sums it up very nicely.
"In general, it's true that metabolic rate tends to drop more with more excessive caloric deficits (and this is true whether the effect is from eating less or exercising more); as well, people vary in how hard or fast their bodies shut down. Women's bodies tend to shut down harder and faster.
But here's the thing: in no study I've ever seen has the drop in metabolic rate been sufficient to completely offset the caloric deficit. That is, say that cutting your calories by 50% per day leads to a reduction in the metabolic rate of 10%. Starvation mode you say. Well, yes. But you still have a 40% daily deficit. "
You don't STOP losing weight in "starvation mode". Yes, the metabolic rate slows, but never stops and it certainly doesn't reverse. But do the math, at a significant caloric deficit, the metabolic slowdown is almost inconsequential.
Truth is, if starvation mode existed in the way it's explained around the SP halls, no one would starve to death.