According to writer AJ Humpage (http://allwritefictionadvice.blogspot.com/2011/04/common-sentence-errors-and-how-to.html) the most common sentence error is keeping sentences parallel while using gerunds. As quoted from her blog: This is enlightening, but how do I overcome this error with the following example: Am I reading her advice wrong? Surely it wouldn't be: The above sentence does not have the flow I am looking for, nor does it fit the same way as her example. Is my original sentence really wrong? She states on another article on her blog that: But what if the secondary action requires no actual effort, in this case, his pulse hammering? Thanks in advance for helping this bemused beginner writer.