The fundamental case for Chipotle Mexican Grill (CMG) above $400 has been very difficult to make since the health scares. Now the technical case suggests this key support area is finally going to break. The following chart suggests the bearish chart pattern called the 'Descending Triangle' has formed. Investopedia uses the following definition for a descending triangle pattern:A bearish chart pattern used in technical analysis that is created by drawing one trendily that connects a series of lower highs and a second trendily that has historically proven to be a strong level of support. Traders watch for a move below support, as it suggests that downward momentum is building. Clearly, traders use a break below $400 as a strong sell signal. A move much lower would finally make Chipotle appealing from the long side. Any break of the descending triangle pattern would bring in traders, but the fundamental story would not add up going long at prices above $400. Disclosure: No position