Hi, wouldn't suggest to use the C leg in expectation of the pattern to complete. Harmonic patterns are traded at the D point, not C (unless you've another reason for entry). Hope you get what i mean! Good trading!
@tamio, if you trade harmonic patterns you have to wait to the D point, yes. However if you find another valid reason for entry near the C leg, then you can set your target2 position (if you split it) at the D point. But notice that the reason for entry has to be valid itself. Have a nice day!