I am a fan of Chris and, while I don't support his actions in the least for clarification I'd like to say that he had the mandolin on his cart and then Art needed it (he had finely slice cucumbers on his plate). He told Art to leave the blade where he had set it and gave it to him in the prep area. Art never put it back after using it. I'd say Chris more than likely had something to slice that never got to the plate since he had to improvise in the end.