Yea, that could have been more clear. If a large fund want's to maintain say 5% apple stock and 5% IBM in their portfolio and consistently balances their portfolio based on a set interval after market changes or even at the same time every day you could discover the pattern and exploit the behavior.

EX: In the next 1/2 a second their going to go from selling at 15 to buying at 16 that's almost free money.