I have tried hard this weekend to try to slip and fall in my whirlpool tub. I can tell you this much; it's darn near impossible to hit your head without bracing yourself with your arms.
Not only that, you naturally use precaution when stepping into a tub. When entering it, you have to enter one foot at a time. You also naturally use one hand at a time to grab something when entering. This helps you KEEP your balance, not lose it.
Had KS slipped, one leg/foot would have been OUTSIDE of the tub, making it IMPOSSIBLE for her entire body to end up in the tub.
I really have taken an about face here and feel DP is going down.
And how many bruises were found on those arms that she would have tried to brace herself with as she "slipped and fell"?