Most humane way to cull a 4 week old chick

[Starshollow]

Hey everyone
I bought a batch of week old chicks and when I unpacked noticed one had a bad leg.

I think it is a slipped tendon. Her name is Robin. I did try to do the chick chair thing but she constantly escaped it. I decided since she was getting food and water and getting around that I would just make accommodations for her and let her be.

I had another chick (Reid)from this group go paralyzed a few days later. I did the chick chair and heavy vitamin b therapy for just over a week and she is wobbly but walking and has been back in with everyone all morning.

When I was cleaning out the brooder I noticed Robin wasn't even putting weight on her leg. I had spent all my time with Reid that I didn't even notice and I feel terrible.

When I finally picked her up her leg is almost twisted backwards. I know I have to cull her because she is in a lot of pain.
What is the most humane way to do this to an almost 4 week old chick?

I read another post that said sharp snips if they are under 3 weeks but we are just past that and I don't want to have her suffer.

Thank you

 

[ChickyCh00k]

https://www.muranochickenfarm.com/2017/06/the-easiest-way-to-cull-chicken.html?m=1

This may need to be slightly modified for a small chick, but I believe it's still applicable.

It is a fast and humane way to euthanize.

 

[ChickyCh00k]

Also, sorry about yoir chick!

I know it's not easy, but it is *kind.