Help them or not?

This happened It was two days ago after a short walk with Amit from home to his break-dance class/lesson. We arrived to the place it was a at the building and it was our first time so I had to figure out what floor it was on. look for the place which floor it is?
And then,in corner of my eyes out of the corner of my eye, I heard some a woman with two children that said to her sun saying to her son, "Yes, break-dancing is on the second floor" then I decided to join her because she probably knew the place.
When the elevator door opened in second flore on the second floor, we here heard screaming and I looked and I saw her daughter screaming because her fingertips was Perceived were caught in the door. Immediately I jumped and took her hands out of the door... It looked like there was no damage, just put the fingers in the water and it will be fine. But instead of thanks I get criticism. "You shouldn't do things like this, it's dangerous. You could damage her finger." 
I was shocked. I didn't have anything to say. I meant well (or: I had good intentions). And also, what I'm am I supposed to do, lying lie back and see watch a small child screaming and not try to help?

בטח שהיית צריך לעזור לילדה. חבל שהאם לא העריכה את המעשה הטוב.