It was a sign that the longs were staying with AEXP, and the flippers were getting a little nervous and taking profits in MNLU.
MNLU should bounce hard back up from here, as it covered the .20 to .22 gap now, and has retraced the fib retrace of 50% for a completed wave 2 retrace!!! May gap up hard at the open tomorrow, to start the really big move higher.