impulses are counted with 1-2-3-4-5 and leg 1 or 3 or 5 must be the longest, in this case we have leg 3 as longest, "if" leg 5 stops as the same size as leg 1 will allways retrace at least to the 4th leg and depends on the trend of the begger timeframe this could retrace to 61.8 fibonacci and allso to the beginning of the impulse.