They also can come open in your pocket.
Sharp is the word alright. But I never felt totally safe with mine, so it tends to sit safely in a drawer. Probably says more about me than the knife, to be honest.
Stalker in the next village did similar to his knuckle very nasty ,like the opinal but wouldn't use one for deer work as there are many cheep safe alternatives .I severed a finger tip as a 13yr old with a No.10.
9 hrs in surgery and 6 weeks in a middle finger splint (try explaining that to the teacher you just gave the finger too inadvertently!!)
one way to learn about the lock collar that you won't forget