This law is specific to situations of imminent or actual physical harm. Also notice the way the law is formulated: non-assistance (negative) and not a an explicit duty to assist (positive).
Yes, you are. That's the whole point of the law and what the precedents confirm. You have to assist to the extend of your ability too. If you witness something and don't call 112 (well 18), you are guilty. If you are a medic and don't do your best to stabilize the person, you are guilty to.