speff,
Let me try to explain why in market trading something like what happened at 150 is a matter of individual interpretations depending on one's own view and may be imagination.
My view is that anytime to cross such numbers (round 150's 160's etc.) it is subject to demand supply rules... and there may be many participants who select these round numbers to enter or leave their involvement in the stock,for their own reasons and timing needs.
The dominating group apparently was Supply... versus Demand in this one. Thus price bounced off as it reached that juncture and went down.
A larger number of shares in Supply probably had been in place to sell at $150. Plus probably other traders (day trading/traders) who watch the trading action closely may have also sold.
However, these junctures are difficult to guess as the reverse could have happened as well.
Conclusions purely based on one circumstance happens to be questionable, imo. It depends on who is dominating the Supply/Demand equation. Price follows in the direction of either of them when it exceeds the other side.
Cheers & GLTY
Market Data 
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