When EADA Stone is speaking to the Assistant U.S. Attorney prosecuting Cobb, in order to get Cobb to testify in Stone's murder case, the AUSA says he would be willing to allow Cobb to plead guilty to three counts of federal racketeering, with a sentence of three years per count, for a total sentence of nine years in prison; versus the minimum sentence of 30 years if he was convicted at trial. However when Stone presents the offer to Cobb he says the deal is three counts with six years per count, for a total of 18 years.
Leslie Hart's lawyer doesn't know the New York Penal Code very well, when attempting to negotiate a plea deal she says her client is willing to plead to conspiracy in the second degree (a class B felony), if Stone drops the murder charge. Stone counters with an offer of manslaughter one, which is also a class B felony but has a higher minimum sentence than conspiracy two. Then Hart's lawyer counters with a plea offer to conspiracy one, which is a more severe charge with a much higher sentence than manslaughter one, and doesn't even apply to this case. Conspiracy in the first degree is when an adult, over the age of 21, conspires with a minor, under the age of 16, to commit a class A felony; it is a class A-I felony (same category as murder) and carries a mandatory sentence of life in prison with the possibility of parole after 15 years. Compared to manslaughter in the first degree, as a class B felony it has a minimum sentence of only 5 years in prison (8.5 years for someone with other felony convictions) and a maximum sentence of 25 years. So she just offered for her client to plea to a charge that would get her client a life sentence when the manslaughter charge could get as little as 8.5 years.