Don't see anything abrupt? Seems pretty typical ending for a common sci-fi subgenre that is still very popular today (I won't give more details to avoid spoilers). Sure, you can continue and make a whole book out of it, but it makes a good self-sufficient short story too.
Perhaps the page got truncated? For me, it ends with word "funny".
I don't believe I've reread it since its original appearance, and I refuse to do so now — for fear of discovering how little I have improved in almost four decades. Those who claim that it's their favorite story get a cooler and cooler reception over the passing years.
Perhaps the page got truncated? For me, it ends with word "funny".