RE: Trading update10 Jun 2020 11:24
Often, if a stock jumps between two points (up or down), without trading in between, leaving a gap on the chart, it goes back to fill that with trading at a later date. That's the basic principle.
Of course, like an awful lot of "technical analysis" or as I prefer to describe it "drawing lines on charts to try show trends/patterns in trading in a business which has fundamentally changed, or whose market has fundamentally changed, therefore invalidating older data as a credible reflection of demand/supply in relation to current situation", it's basically got no credible logic behind it ;)
Then again....that's not to say technical analysis or mantra like gap fills don't work or won't be right. The increasing amount of people substituting technical analysis (which requires no real knowledge or particular skill imo) for fundamentals based investing (or a combination of the two) means that it is bound to have a self-fulfilling impact on the trading of any stock.