One good turn deserves another

I did a good thing today.
We lunched at Jurong Point, and while waiting for the rest, I was glancing around and saw a feather duster (those multi-hued ones) on the floor. Apparently 2 ladies who just passed dropped it. I picked it up la pronto, and hurried after them. They were already on the escalator down and I had no choice but to follow-on retrospect I could've just left the thing on the escalator behind them and all they had to do was just walked a few steps back to retrieve it; but I guess all I had in mind at that time was to return the thing to them-they thanked me profusely and apologized for the same time: I had to ride the escalator all the way down and then up again...