Deva, a channel has two parallel lines with the lower (in this case) anchored through the lowest close in the upmove and with slope of the 18ma. If this does not enclose all activity, slide line to right while maintaining slope until all is enclosed (all closes, and most liws). A violation is thus a price below this line, and will not be sustained unless the top is in place. No half span, no FLD. Just a line with the right slope.
Oddlot
Stay on the right side of the cycle!