I went to beach at a friends and didn't cut the engine soon enough, I heard a light tapping/scratching noise as it was sucking something up so I cut the engine really quickly. Well I went to leave and it would vibrate heavily when I gave it gas. It idles just fine but anything faster than 3mph is bad. I'm guessing whatever it was (shells or pebbles) it bent the impeller and damaged the wear ring. Is it possible whatever that I sucked up is still in there? I'm just really confused because I went back to the beach and didn't see anything but sticks and mud plus the obvious sand.