Replying to Attempted my first 3 backflips - fucked myself up pretty good

So I was getting tired of pushing off attempting a backflip. Entering my 2nd season with probably 5-7 total days in the park, the jumps kept tempting me to try a backie.

Finally sacked up tonight off a sketchy 3 foot kicker over a decent knuckle into a moderate downslope (but completely iced over landing). First attempt was my best I more or less landed it. Second attempt I didn't get enough rotation and landed on my nose tips which sent my knees directly into the ice and really hurt myself.

Stupidly tried a 3rd time but at the last minute I realized I couldn't bend my knees anymore and I hit my helmet on the lip and just ate shit.

I think I lost my confidence now but I am somewhat worried about my knee. Any bro science majors here? I don't feel any instability in my knee but it hurts like a deep muscle/bone bruise. I can't bend down parallel to the ground. Anyone ever do anything similar? Definitely gonna start wearing knee pads now if this is what happens when I under rotate.

I may wait to try this again on an Air Bag. I thought I had it figured out but the potential injury makes me not want to huck it again until I practice it on a safer jump first.