Ballard Power Systems: sell signal, but the drop is already steep

Ballard Power Systems receives a fresh weekly sell signal, at week 1. This week's drop was among the sharpest: signal strength at 86 out of 100, with sellers extremely dominant in the last bar. That reading, however, calls for caution: a drop this wide opens the door to exhaustion, not confirmation of the decline. The quality band flags trading as not recommended and the confirmation week is still in progress.