What does previous candlestick high to low inside close means? 

youtube subscriber question
——————
Hi, what does this mean please: “previous candlestick high to low inside close”? This seems to be the essential message of this teaching but it is not understood. Can you perhaps explain better and/or draw a diagram of what this means up close? Thanks much!
——————
lack of power to go more higher direction or lower side.

here is video