When clipless are set up with only just enough tension to prevent you from ripping your foot out during your normal worst case uphill you'll find that when fueled by adrenaline that the catch in the pedal is no match for your leg in an emergency. I've had a couple of near misses over the years similar to your case and my foot "magically" was able to dab on the ground to save me and I know full well that I didn't twist to the outside other than perhaps as a by product of my reaction to "MOVE LEG NOW!" from my brain.

Add to this the double sided format of any MTB clipless that avoids the need to flick the pedal and clip around and then fumble your foot into it (I know, you learn how quickly enough) and for me it was an instant winner and complete no brainer.

Just set up the tension for the minimum and carry the allen key on the first few rides. Set it low on purpose and if your foot snaps out where it shouldn't dial it up a click at a time (all four together to maintain consistency of course) until you don't find you're tearing out of them.