Spec Trade: Buy a July corn limit down at 643.4 GTC with a 626 stop

Looking at the July corn chart, you can see the 4-hour chart support comes in at limit down.
If the moving average gets bumped, it typically holds if it pushes through by another 10-14 cents before resolving back to the upside.

The low that July corn is rolling into right now should be the A wave before a rebounding B wave bounce that would expect to find a recovery back into the 675-685 range.