Argus Group Holdings and Bermuda Commercial Bank each tumbled sharply on the Bermuda Stock Exchange yesterday.Argus fell 40 cents, or ten percent, to close at $3.60 on the trading of 1,900 shares.BCB slid 6.5 percent on very low volume. Three hundred of the bank’s shares changed hands as its share price fell 75 cents to $10.75.BF&M Ltd also dipped 2.8 percent on the trading of 100 shares. The insurer’s share price slid 45 cents to $15.55.The Royal Gazette / BSX Index fell 14.82 points, or 1.38 percent, to close on 1,062.80. Volume was 12,751 shares and turnover topped $108,000.