USDCHF Conforming to a Common Slope

FX:USDCHF   U.S. Dollar/Swiss Franc
Here's the common slope (an up slope) that price has been conforming to (on weekly bars) in recent years. How come even the surprise SNB decision stopped the price exactly at the point (in price & time), where the up slope was marking the resistance? Next? Well, even though the USD is one of the strongest currencies , the CHF is even a stronger one, so I can't help expecting another leg down...
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