I swear, my point is to help them look better in winter, not to test my new knife. Definitely not.
Well, maybe I am a little bit curious about the sharpness of the stone tool, but only a little. The main intention is to shave them without any harm.
My grandpa likes to use scissors to cut his facial hair instead of using a real shaver, so I guess using other substitute tools might also be capable for this situation. However, since I don't have the skill to safely cut others' beards with scissors, a small handy knife might be the only choice — I saw barbers using it to shave their customers so I knew this knife can work on them. Of course, I have considered other tools: the multi-tool Swiss Army knife is too sharp and dangerous for shaving their beards, much less the kitchen knife.