It gives the impression that this is an adverbial phrase of mode. The adverbial phrases are usually formed by a preposition (to) more a (machete) noun, adjective, or adverb. They serve the same function as an adverb and therefore are used to express and to modify the action of the verb. Examples: a foot, on the sly, little by little, wide, fashionable, horseback riding, etc. As to the meaning of a machete , I don't know it. Hopefully someone else clarify it.
Machete is an expression used to indicate that an action or task is done using all its available energy without bring in expenses or thoughts that can come down the action. Go blind to something it could be a similar expression. John seeing that they stole his wallet was a machete to the thief while this was armed.