Reviewing with River

I am following three authors on another writing site. They post each week. I've been doing line edits. Mostly things that don't make sense or they don't elaborate. They are posting long chapters at times. I find they like to know what I suggest. for instance the woman wrote. "She disappeared. Then came back with a soda." Really I asked, she just disappeared and poof reappeared? Then I wrote a suggestion on what it might sound like. She loved it.