Brian -
Lower the bar partway with the arms, then pop up on the toes to meet the bar, and immediately drop flatfooted with bent knees to absorb the weight (keep you chest up).
Watch these videos to see what I mean -
http://www.cathletics.com/wod/video/ohsHeavySingle.mov
http://www.cathletics.com/wod/video/gregPowerCJWO.mov