Yesssss...... you got that perfectly... that is usually the point I end up buying at market... and just wait...for the Jump...
In the same way over some period....you will get the hang of whether it is going to move down or up....down is usually followed lower & lower 'Ask' when the the spread narrows... observe and practice and you will perfect...with few shares at a time....
To start with if you detect narrow spread...and enter... ideal thing would be to exit at the jump the kind you noticed in CIL @ 322 from 319
....and once you have practised this scalping with good success, you will automatically develop.... the foresight in strength & be able to judge... till where it can go....
....initially it may drain you mentally & physically... but with time... it will become second nature...