What do his actions in paragraph 3 say about him? What happens as a result?

In the third paragraph of the story, the sniper faces a dilemma. On the one hand, he wants to smoke a cigarette but, on the other, he knows that lighting the cigarette might give away his position to the enemy sniper. After thinking it over, the sniper goes ahead and smokes a cigarette.
This action reveals two key points about the sniper's character. Firstly, that he is prepared to take risks. Although he knows that he may give away his position, he is brave enough to face the consequences.
Secondly, the fact that he understands the consequences of lighting a cigarette shows that he is well-experienced in this role. He has a military background and has carried out this task before.
When the sniper lights the cigarette, his fear is confirmed. It reveals his position to the enemy sniper, causing the enemy sniper to fire a shot in his direction. Luckily, the shot misses the sniper but this near-miss forces him to develop a new plan to get safely off the roof.