Increasing short exposure with GM

Today's weak market had me looking for shorts, and this is what i found so far:
An 8 day run up has been broken at a key resistance level.
6 days before earnings - the price should be rather directional at this point - if the idea is wrong, then the exit will be quick, above the current swing high.
Has been relatively weak since mid march, which is a good background for this trade.

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