Although I'm not sure exactly what you're asking, it looks like you'e been waiting a while so I'm gonna give it a shot. At the beginning of it, It says began to rock which is present tense so it makes it sounds as if it is happening as we read it but then threw is past tense which makes it sound like it already happened.
Again I'm just pretty much guessing but that's all I got. Sorry if it didn't help but I tried.
