Anti-selection
The dip today is reflective of potential news coming IMO. This is a trading pattern that plays on the conscience (anti-selection) of players within the markets. People who are vulnerable consistantly trade into sharp focused selling pressure just before announcements are made. This is the phsycological phenomenon of Anti-Selection. You will make decisions based on short term circumstances vs long term objectives at the time waiting for news expecting that the horizon for news is known when infact the horizon is variable. If you have traded out of your position based on the selling today, I feel your pain. If you have bought today Warren Buffet is wealthy because he had taken advantage his rule. (Buy when the market is selling and sell when the market is buying).
GLTL