Person Of Interest S1E7

setting:
The setting of this television show is that there is a machine will randomly give the protagonist a social security number. It tells them that this person whether is a perpetrator or a victim. Under this limited resource situation, they have to work carefully to protect someone or prevent a tragedy happen.
(Protagonists: Reese, Finch)
Plot summary:
In this episode, a men named Benny is killed by the Russian mob in a bodega. Police thinks that this is a retribution because Benny’s boss who named Elias has taken out half a dozen elder in the Russian mob. Police also finds a witness in this incident, but somehow he has vanished. In the meanwhile, the protagonists receive a social security number which match this witness. So Reese comes to this witness’s house and get the information from Finch knowing that this person is a teacher which he exactly appears to be a teacher. Very soon, Russian mob’s car are arrived, a lots of people get off the cars with guns seems to they are very desired to take out this man(witness). Reese does not have any choice, he has to move faster than them before they get to this teacher. Under the Russian mob pursuing, they have to hide in the drug dealer’s place.

Needs:
Needs in this episode is the social security number from the machine, if protagonist without it, they will have no target to save. Russian mob needs to kill Elias because if they do not kill him, Elias will kill all of them instead.