Peter throwing his knife at Caspian is -- at least for me -- an expression of how angry he is, and how eager to strike out at something, even though there's nothing for him to strike out at. It's the equivalent of punching a wall; the closest equivalent in the movie is probably when he draws on Caspian after the failed attack on Miraz's castle. (Like in your gorgoeus icon!)
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Peter throwing his knife at Caspian is -- at least for me -- an expression of how angry he is, and how eager to strike out at something, even though there's nothing for him to strike out at. It's the equivalent of punching a wall; the closest equivalent in the movie is probably when he draws on Caspian after the failed attack on Miraz's castle. (Like in your gorgoeus icon!)