Giving my Lamy Safari and the watercolours another chance tonight at my weekly, evening class.
The “charging in” is a watercolour technique which means you continue an “activated”, washed area with a new colour.
E.g. you mix 3 washes on your palette (me, I mixed a green, a yellow/orange/ocker, and a greyish blue). You start washing an area and then switch the colours and let the new load of wash touch and mingle with the still active area.