Last I looked, no state had a "Good Samaritan" law, so you definitely could have left here there to bleed. But you apparently have a concience. Good for you.

Generally, if you do help, you aren't liable unless you make the person's situation worse (Jump, I'll catch you). However, not being liable isn't the same as not being sued. Hope your homeowners insurance picked up the legal fees.

Remember, it's 98% of lawyers that give the rest of us a bad name.