I’m guessing you mean the inverted crucifix? Where you go into a basic invert and let go with your hands?
Anyways, try getting into the regular crucifix first. Experiment with leg placement and thigh grip so you can rely on it when you’re upside down.
When you go into a basic invert, your hands will obviously be in between your thighs so you won’t be able to squeeze all along your leg yet. So when you’re in the invert position, first take your bottom arm off the pole, reach down and grip the pole below you and tighten your thigh grip a bit right after you take your arm off. Your top arm is still there in between your legs, now take that one off too and squeeze harder with your thighs. Turn your waist around so you’re facing the pole and grip it with both hands now. There you go, inverted crucifix https://www.studioveena.com/img/smilies/icon_e_smile.gif This way you’re basically gripping the pole with both hands and legs at all times and you’re gradually tightening your thigh grip.
Sorry about your fall, hope you didn’t injure yourself. If your legs are gripping correctly you won’t fall anymore, just make sure you don’t rush the move. Before you do it, play it out in your mind step by step!