This kind of behavior is common to housecats too - they'll lame a small animal and bring it to their kittens for practice.
Another thing worth noting - most cats like to eat their prey intestines first without caring whether or not it's alive (for pre-digested fiber and other nutrients not common in meat). For larger cats that often hunt by leaping from above and breaking the neck in one stroke the prey will probably be dead, but otherwise they're probably not.
Even without kittens, house cats will often take a captured small animal inside (still alive) and dump it near their caretaker and expect them to finish the job.
Our cat has only access to a confined (extremely high walls) garden (largely left to grow wild for environmental reasons) due to proximity to a road where people drive extremely badly, and still manages to occasionally succeed at bringing something in, usually dumping it at someone’s feet and going “ok you do it”.
My interpretation of that behavior is that they think you're a kitten. After all, they've never seen you kill anything! It's reasonable to conclude that you need some practice.
Another thing worth noting - most cats like to eat their prey intestines first without caring whether or not it's alive (for pre-digested fiber and other nutrients not common in meat). For larger cats that often hunt by leaping from above and breaking the neck in one stroke the prey will probably be dead, but otherwise they're probably not.