Clearly something has changed, because this is becoming an increasingly common occurrence. One of my good friends and a competent dive instructor here in the Channel Islands just came back from Diving the Blue Hole a couple of months ago with ADM and told me of an identical experience. In fact, one step further, she was monitoring her own computer and NDL's and began to ascend a bit in the water column, only to have the DM grab her by the fin and yank her back down to 130ft. By the way, she ended up with Skin Bends after that dive..