The Neto Roll is a sneaky little technique that I added to my game awhile ago. Odie Neto is a 2003 NAGA World Champion who runs a school down in San Diego, CA.
What makes this tech possible is the Half Guard position that your opponent uses. If they are using the Figure 4 leg position then this is a cool way to catch them off guard and take their back. Always a good thing.
If your opponent is using the Lockdown then you have to first defend the lockdown before you go for the roll. If you roll without first defending the Lockdown then you run the risk of a meniscus tear or worse.