Nexen (NXY, news, chart, volatility) is seeing unusual order flow. Shares are down 90 cents to $16.50 and 7,800 calls traded, which represents 11 times the expected volume. All of the day’s trades has been in fewer than 350 contracts and more than 60 percent is trading offer-side. Implied vols are reaching towards 100, up from about 90 the day before.