The default line style for plot() is the draw a line between each pair of points. If it is OK to not have any of those lines, then you could plot just the data points, for example
plot(Fall(:,2),Fall(:,3),'.')
However, if you want the lines except when it "backtracks", then probably need to split your data into separate series for plotting. You could do this by deftly inserting NaN into your vectors where the backtracking occurs. Here is a simple example of what I mean. Notice the difference between the two plots.
x1 = [1 2 3 1 2 3];
y1 = [1 2 3 3 4 5];
figure
plot(x1,y1,'-')
x2 = [1 2 3 nan 1 2 3];
y2 = [1 2 3 nan 3 4 5];
figure
plot(x2,y2,'-')
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