How far away was he? You can't expect to bring a tom in from a long ways away with 100% success. Always keep in mind that he's used to having the girls come to him, or at least them meeting him part way. If you really think he was intimidated or scared by your decoys then next time just use a simple hen decoy. That way you don't run any risk of him being put off by thinking he might have to compete with another male.