Brightpoint Inc and the ability to switch sides

I'm showing a chart here of US stock Brightpoint Inc which shows how trend followers can have the ability to switch from short to long in a matter of days.

This stock had been in a pronounced downtrend since the beginning of February, which would have generated healthy profits - no exit signal was given until at just north of $5. There then followed a period of consolidation, and a failure to break to new lows, before a new long signal was given last week, also just above $5. Then today, a buyout has been announced, sending the stock price up over 60%. So again, simply following the trend would have meant you would have profited in both directions, whereas an investor who had held from the beginning of the year would still be showing a loss, even after the acquisition announcement.