Korban3 wrote:IK. It's possible to just drag the entire larger's body down. The taller enemy would just be leaning back more as they are choked.
This is probably going to be really nit-picky, but here goes:
No.
If you have a size difference like the one between rabbits and rats, the victim would have to lean so far back that his chin would end up on his chest. You cannot choke someone like that. If you somehow managed to get your arm underneath his chin before locking in the choke like that, the result would be a neck crank and not a choke. And you'd actually stop the neck crank from working properly with your own arm. And there would be a lot of pressure on that arm.
In order to pull a rear-naked choke on a taller opponent you need to lower them and bring your hips close. During the choke the hips thrust forward while you pull the choke tight. People usually secure the position by performing a body lock with their legs. And the whole thing generally ends on the ground with the opponent either falling back or forward, with the guy still holding onto the choke on his back.
Here's how the standing position looks like with just the hooks in instead of a body triangle.
(Ronda Rouseyy vs Liz Carmouche (on the back))
It's much less secure that way. Notice that Liz didn't actually manage to get under the chin. There is no choke here, just a potential sideways neck crank. Moments later, Ronda managed to shake her off to the side.
Here's how the body lock position looks like. (Interestingly, from the same event as the fight above.)
(Uriah Faber (on the back) vs Ivan Menjivar)
How he got into it was pretty badass.
I hope you can see it because for me it's not showing up properly.
Here's a more traditional entry by him (this time with one hook, instead of a body triangle).
The point is, as a smaller guy, you need to somehow lower your opponent and the get in close. If you want to stay standing, you'd need to put your opponent on his knees or somehow sit him down. If he keeps standing, you need to pull something similar to Uriah Faber and hope that your opponent's lights go out before he can walk you into something.
If there is distance between your hips, you'll have a really hard time choking the guy. The neck crank can work, but you hinder yourself with that arm. And it's obviously much more dangerous for the opponent. Neck cranks don't cause unconsciousness. They nasty snapping sounds, usually followed by death.