just get to the bar.
then wind up the safety-line.
if you have a wipika-like setup with long leader lines, wind up double the lenghth of the leader line.
if you have a system likt the naish x2, north, airush etc. just wind up what slided through the bar ... .
then start winding up all 4 lines to get to the kite. if you're there, detach the lines from the kite and start swimming