sentence: A man wearing a black clothes is sharpening the knife on a stone. sentence:  The man beside him on blue long sleeves drawing something on the table with his finger. sentence:  The man turn the knife to sharpen the other side and then wipe it with paper towel. sentence:  The man in navy blue shirt point to the knife while the man sharpening the knife tries to sharpen it one hand. sentence:  He continues sharpening the knife, turn it again to further sharpen the other side and wipe it again with paper towel. sentence:  Throws the old and dirty paper towel and reach the roll of paper towel and clean the knife.