The blue arrows show the relative airflow (the combined effect of wind and upward movement of the glider) over the top and bottom surfaces of the wing as it moves up during a launch, the smaller the creases formed by the lines the quicker the airflow becomes laminar and attaches as the wing starts to fly up.
In a ‘New school’ take off the pilot fly’s the wing up instead of running hard, ‘committed’ (an apt choice of terms perhaps!) being replaced by ‘curves’ used both in pressures and speeds as the pilot alters inputs to suit what the wing is doing at that moment. ‘New’ starts much as in the old method but as soon as air has been forced into the wing the pilot reduces riser pressure letting the airflow ‘attach’ to the upward accelerating wing instead of ‘wind’ pushing against it. Hint. It helps to get your flying buddies to video you and the underside of your wing to study this, less and smoother inputs being what you are looking to have, letting the wing get on with the job of flying as it is designed to do!
The pilot may even alter their speed to such an extent that they change direction of movement to temporally move backwards under the rising wing (look at the pilot compared with the tree trunk in the background in picture 2 to see moving back under the wing) all the time monitoring the amount of force (and its direction) on the risers, which is ideally both up the length and to the front until overhead when most should be just up, as well as keeping in touch with the brakes (they indicate how much energy is in the wing) all this even in light conditions leaves runway in front of the pilot with the wing already stable and flying, letting the pilot AND the wing pick up ground (and more air) speed into a smooth lift off ready to work the ridge/thermals at max efficiency!