I've noticed some of the juniors at our club using a slightly different technique for backhand low serve. They strike the shuttle with the racket nigh-horizontal, which I know is now allowed. However, the racket head is moving appreciably up as well as forwards. It's similar to how I would play a "top-spin" shot in tennis or squash. Does anyone know if this is now the considered wisdom on b/h low serve? If so, what advantages does it give? From my observation, it seems unstable. Far too high a percentage go into the net.