Wyckoff trading method, page-701

There was definitely some selling pressure on the upthrusty looking bar no doubt,
however it may also be an absorption bar (which can sometimes look very similar, and usually appear in uptrends, or with strong buying in the immediate background), and only the preceding price action will confirm which it is. If price slices lower and begins to breakdown, then yes it was a serious selling event of some sort. But if price only closes the gap (or makes a decent attempt to - as the gap fill rate on that type of gap is reasonably low) and does not actually breakdown, then there is a decent chance it will either consolidate sideways as it goes through the process of removing the supply that has been drawn out, or test and find that the selling pressure in not ongoing, and price makes a second challenge higher.

MXC Daily -