I need to write a teaser on "The Sniper" by Liam O'Flaherty. Could you provide an example of a teaser for this short story, a 50-word summary or review that would tempt someone into reading "The Sniper"?

"The Sniper" is a great story. It has action, suspense, and tragedy. The fact that it ends sadly is a real downer, but it always sparks great reactions and discussions from my classes. The key to writing a good teaser for this particular story is to not give away the ending. This means that you cannot write about the sniper killing the other sniper, and you definitely cannot write about the fact that the two snipers are brothers. That would not tease anything. It would be a spoiler paragraph.
Fifty words is not a lot of words to work with, and a good teaser needs to raise interest from the very first sentence. A good place to look for inspiration could be the back of any DVD cases that you have at home. They usually contain a little blurb that tries to entice potential viewers to watch the film. I have seen some really bad movies in my life, but I have never read a back-of-box blurb that made the movie sound boring. If you do not have any DVD boxes to look at, check out the back cover or inside jacket cover of a novel. These will have a description of the book as well, and they are generally near that word limit. Again, they have to make the book sound interesting because the author wants to coax people into reading the book.
In general, your teaser needs to entice readers to read more. This is done by keeping certain details a secret from readers. However, some details do need to be given. For "The Sniper," I would give your readers information on the setting. Focus on the fact that it is staged in the midst of a civil war: of all the types of wars that are out there, a civil war is generally assumed to be quite bad because the country is literally ripping itself apart. Second, focus on the two snipers. Use the word "sniper" because readers instinctively know that there is a hardness and mystery to a sniper. It takes a hard and cold individual to shoot and kill someone without that other person ever knowing they are in danger. You could start your paragraph with something like the following:
"A country is in the middle of a horrific civil war. Two snipers on opposite sides of the conflict pit their wits and talents against each other."
That is already half of your word count. The rest of the paragraph is up to you. You could focus on how the enemy forces are closing in on the one sniper, or you could focus on the concept of "one shot, one kill." You could even focus on the fact that even though one of the snipers is wounded, he is still incredibly dangerous because of his experience and ability to adapt.