Let Me In (2010)

Continuity mistake: When Abby slaughters the bullies, we see most of the scene from Owen's underwater point of view. First, a decapitated head floats down, leaving a trail of blood. Then, more dismembered bodies splash into the water. We get the sense that the pool water around Owen should be pretty bloody. Yet, when he surfaces, the water around him is completely clear, with no evidence of any blood or bodies.

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Abby: Just so you know, I can't be your friend.
Owen: Why not?
Abby: That's just the way it is.
Owen: Well, who said I wanted to be your friend? Idiot.

Trivia: The name of the town where the story takes place, "Los Alamos", means "the cotton woods." so it's only appropriate that the story takes place in the winter, when all of the woods are covered with white snow.

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Question: When Abby comes in to slaughter the bullies, we only see what Owen is able to (not very much, since he's underwater.) There's something that looks like a lot of glass bits, and then something is dragged across the pool and the blood flow begins. But what was the thing being dragged?

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