It takes time for water to flow. If you’re going really fast, then the water can’t get out of the way quickly enough. The water will behave like a solid to you. Bullets tend to be going VERY fast so they bounce off the solid (to them) surface of the water.
Barefoot water skiers make use of this. If you’ve seen on of them fall, they do not just sink into the water. They’ll skid across the surface of the water until they slow down enough to sink.
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