The Reverse De La Riva is a pretty fancy display of guard artistry. If it was a hairstyle, it would be a something like a pompadour. Unlike it's only moderately fancy cousin, the traditional De La Riva guard, the Reverse DLR gets most of its bang from an elaborate inverted through the legs back take. Helio would definitely not approve, but this guard is here and it's dangerous to the unknowing defender. Don't be that guy. Be the guy that laughed at someone's Reverse DLR and, instead, wages his/her own attack.
Stephan Kesting, along with his site, Grapplearts.com, is one of the very best sources for BJJ technique and overall instruction online. He's been doing it forever too. I literally owned his kimura attacks video series on VHS way back in 2003 or something. Watch and learn as Ostap Manastyrsk takes us through his counter to the Reverse DLR.