A helmet is a good start, but sometimes you just can avoid some injuries. Also, learning how to fall on a foil is crucial. Lots of great youtube videos out there. Bottom line, don’t try to save/prevent you from falling once the board reached a certain angle, instead, just fall in the direction you were/are headed and restart.
When you try to save a potential crash, that is when the foil and you buckle and the foil folds up towards your face. As soon as you watch a few videos on how to fall/ride the injuries almost vanish