Ah, the ninja roll choke. One of the most ridiculously named chokes in BJJ. However, the choke itself is legit. Though the idea of simply draping your gi tail across someone’s neck might not seem like something that works, it’s actually a fairly easy technique to pull off.
Personally, I drag my gi tail across their neck as I attack the americana on the other side. It forces the opponent on bottom to chose to either give up their neck, or their arm. I’ve had lots of success with this choke ever since I first learned it. Because it’s uncommon enough, people rarely see it coming. Give it a watch and see if it’s for you