Nice. To my eyes you could have slowed it even more tbh.
The problem is the sound. The sound will by default also be stretched and if you have no clear audio of what you want to hear (the RPG flying etc.), it will sound weird. In this case there were people talking in the background and so you would not get a proper fitting sound to it. So removed the sound from the slow motion itself and copied the sound of another RPG flying by over it. While it is not perfect in this video, it worked pretty well and it is mostly because I finished this at like 1:30am. I will probably start to make myself a small sound library of standard sounds like L85A2 fire, explosions etc. for future use.