Just tell the one who understands English the best that if they get their fingers in the way of the rotary cutter, it will be the same as getting their fingers in the way of a meat slicer because that is exactly what will happen. Not only will it be a costly trip to the ER but the material will have to be washed and possibly ruined if the blood isn't removed soon enough. I have become very patient with myself when using my rotary cutter.