In the QRH checklist for the 737 NG which uses Flap 15 for landing there is a Go-around procedure review.
In it the checklist states that in the event of go-around the pilot should either fly the corrected Vref speed or the minimum manoeuvre speed (top of the amber band) which ever is LOWER.
I cannot seem to understand the reason for using the lower speed of the two. Someone mentioned that it is similar to what a pilot would do like with the BA 777 at EGLL when they lost both engines. The pilot in that case pitched down to gain airspeed. This reduced speed reduced the G and it was better to fly the aircraft into the ground than stall it into the ground.
If anyone could explain the science behind this I would be very grateful.