Looking back

please check my incomplete story and tell me how to improve it?

He was tangled with iron shackles around his whole body. Below him were oil barrels. On the table, front of him was a time bomb. There was half an hour left till it exploded. His face was covered with oil. He tried to get free from the shackles but the more he tried it was only failure. Suddenly, he felt a severe headache which resulted him to become unconscious.

After a few hours, he regained some of his consciousness and heard a familiar voice. he recognised the voice. He looked up and saw it was Jason, who proceeded towards him, poured water on him and said “wake up”. After that Jason laughed ridiculously as though it was funny pouring water at someone who had oil covered on his face. After the oil was removed from his face he could finally see the criminal accurately.

Jason stopped laughing, proceeded towards him carrying a gun in his hand. He hissed at him
“How do you want to die? Do you want me to shoot you this instance, or blow you up” but there was no reply for he was unconscious. Therefore, Jason slapped him and eventually he woke up. Jason gave a grin smile at him and said in a slight whispery tone:
“ I think you actually want to die here. Like who, which damn idiot can save you now. And Indeed this punishment is very severe”. After saying this he laughed and whispered “have any last word Tyler?
Tyler looked at him and apologized saying “sorry” to which Jason gave a angry look and said “its too late now. If only at that time you did” and smacked him with his gun on the back of his neck. Tyler felt unconscious again. Jason steeply walked away from the room, turned the lights off and said “I’m getting my revenge know that, You deserve this”. He then walked out from the room.

Tyler was left in the room. The room was dark with an unpleasant smell from the oils. Tyler vomited immensely due to the unpleasant smell. His face was extremely sweating. Tears came out from his eyes. He muttered to himself
“If only, I was good to him, if only I didn’t snitch of him. I always knew I’m gonna get this” and he closed his eyes.

He was remembering his past. As everything was going to a flashback. He saw two boys were playing. Then another boy came and wanted to play but was rejected by the two boys. He further insisted play but he met a rough blow by one the boy while the other kicked him in the stomach. This resulted him to fall to the ground. The blow made him bleed while the kick gave him a painful stomach ace. He laid to the floor looking dead. The two boys walked away as though nothing has happened.

Tyler saw this for indeed, it is a part of his memory. He remarked after remembering this
“Why did I ever do that. Oh God, please forgive me. I was the one who kicked him. Why did I kick. Did I not have any sense then” and he was very sad of it.
But suddenly something else came to his mind. He started to question himself saying
“Wait, this is not the definite reason for him to kill me. There got to be something else,” and saying this he started to think. The smell of the oil was getting more smellier despite the intense smell it already had. But this did not disturb or distract him in anyway for he was too busy trying to remember.

He closed his eyes for the second time and went back to a flashback of his past. A few years passed after the previous incident. Tyler and Jason were in High School.