Glad you're doing #fiftywords too, I've been thinking for months now to write one as a game fanfiction but didn't find the time to it (I had one planned for "sea," how many prompts ago was that again?)
The best thing about fifty words is that since the "moment" is short, you think on how to word it the best you can.
RE: My First Entry For Fiftywords Challenge: "The Moment He Stops Crying"