Feature or Memoir?

One day on a subway car filled with about 30 people, the writer sees a teenaged passenger slap her 4-year-old child. A pregnant pause. Then another slap. And another. And another. What would you do? What did the writer do?

Hint #1 -- the writer is a former social worker.

Hint #2 -- this piece is really part of a blog. But it is the truth. It happened. And even though the scale is small (not news), the piece's strength is taking something we all (unfortunately) have seen during the course of our day, entering it into the public forum of journalism and have us, the reader, reconsider it's scope and our role.

Written as memoir, I posted it here anyway. It's a piece that encourages the reader to think of how they intersect with their own community. In my opinion, one of the most interesting things journalism has to offer. Thoughts?