If you mean 'freestyle' as in he is making up his rhymes as he goes, i'm sorry but there is no way. Some of it may be freestyle but most of it is written.
"Be slow to speak because the tongue's more lethal than the gun,
when it's all said and done, it's not who won we're one
so when even one is lost our sum is none"
Not that it's a fantastic bar or anything, but that combined with like 20 other dope bars, I just don't think it's possible. Cool song though.
Would you consider this a freestyle?
YouTube - Slaughter - Coldest Winter Ever (part 2)