All due respect to the previous replies and the sage advice given, and in all honesty, I would have to say I wouldn’t.
I have no medical background other than some basic first aid and trauma treatment training, but I’ve never had to use them. I do know, though, that you can lose a lot of blood and still stay alive.
If I was forced to choose to kill out of mercy, I don’t think I could simply because I would always wonder if that person otherwise could have made it. Even in a situation where it is obviously hopeless, there is always hope until there isn’t.
I do know that the screams stay with you. You don’t forget them. Unprovoked, and without a desperate need for my immediate survival, personally, I don’t know if I could do that. Just being real with y’all about it.