Interesting. At my school we call that technique "Bending Wings" and it has some slight differences.
The first difference is in step 7, intead of the front kick to the groin of attacker #2 we practice a right 'twisting front kick' to the back of the knee. When they drop we let go of the ankle and use that hand to keep them in check. Also in step 8, after the twisting front kick we plant the foot and land in a right cat stance, then wind the leg up and execute a right side kick to the inside of attacker #1's knee. And the rest goes as mentioned above. anyone else practice a variation of this?