Having a read and it feels very instructional, ie: he did this, then he did that. Your grammar also has a few errors too, so I think a combination of those could be holding it back.

You can also flesh out parts a lot better to give greater impact to the scene. 

For instance, the first sentence is missing some commas and feels like you glossed over the most important part, the actual stabbing. Reading on and I can see terms like "has and had", "were and then" mixed up, and even brings quickly should actually be quickly brings instead. (also, never 2... Write two)

I feel if you fix up those kind of errors it'll help improve the scene for the most part without rewriting a stack of lines. What I would suggest as well is maybe a little novel reading on the side. Pick up a book like Harry Potter in English and read through it. It will help both with your word structure and understanding on how to write a scene that flows naturally.