I have a mercury 850 and got into the water last week, switched into gear, and heard a bump similar but a little louder than what I hear whenever I put it in gear. But this time, nothing happened. Now my propeller will not turn, the engine is running fine. I am very inexperienced but was told that the propeller should not free turn when out of the water in nuetral but mine currently will turn either direction freely. Help because its getting nice outside