ST, I agree with you (Don't we always?) that point provides valid R. The point I'm more concerned with that would indicate a reversal is the break of the swing high. If that happens, then the peak gets challenged, and then it takes on a whole new structure.
In your chart the 1-2-3 at the right hand side, if the market closes above the horizontal line drawn from the valley low ( from your chart it looks that it has just closed above ) then there is a strong possibility that the downmove has ended and the trend has reversed to up atleast for the time being.
Smart_trade
Smart_trade