Here is a quick submission that you can try when your opponent is on all fours. The difference between the 'Turtle' position and the 'All Fours' position is a matter of space. When your opponent is on his knees and hands/elbows but leaves space between his body and limbs, he is in the all fours position.
Eddie is on all fours and my left knee is deep into his right side with my left arm draped over his back.
I reach my left hand under Eddie's left armpit and grab his left wrist
I bait Eddie by moving my right leg closer to his head, I hope that he will grab my right leg
Eddid grabs my right leg with his right hand
I slide my left knee into Eddie's right armpit
I keep my weight low as I swing my right leg backwards and drop my hips towards Eddie's elbow.
I flex my right heel towards my rear as I lower my base and arch my hips towards Eddie's trapped elbow to finish the submission.
A closer look at the submission