Thats skill, trust me I have been cut from a Gypsy with a 10 cm cardboard cutter, I wish my doc did this sort of job, I would had no scar to remind me of the trauma, but than again the Gypsy striked me on the neck so they had to be fast.
I had this done on me but didn't know it. I was really confused where there was a single random piece of thread sticking out of my body like a quarter inch away from my incision.