I'm sure I saw the hatchet in the Mexican's right hand and it fell out of his hand visibly after he was shot and on his way down to the ground.
But other news reports about the shooting say that he just put the hatchet in his pants and concealed under his shirt, and then attempted to leave the store with it.
Those news reports do not say that he grabbed it or otherwise had it in his hand at any point. But those news reporters could be trying to spin the evidence (lying by material omission) to advance a narrative that white people are racist and prone to kill Hispanics.