it's a bit weird how we don't see any training for the perfect skills with his knife or ot...

it's a bit weird how we don't see any training for the perfect skills with his knife or other 'side' stuff. Really love if it wasn't justified for him to just have studied it and gotten the skill that quick. Especially with knifes it looks a bit out of context considering the mother would be very worried her child is playing with knifes or method acting