A sentence too complicated?

[HaraKiriBlade]

'That's not what justice is.' the colonel jeered, and began pounding the table again with his big fat hand. 'That's what Karl Marx is. I'll tell you what justice is. Justice is a knee in the gut from the floor on the chin at night sneaky sandbagged underhanded in the dark without a word of warning. Garroting. That's what justice is when we've all got to be tough enough and rough enough to fight Billy Petrolle. From the hip. Get it?'

I've totally lost track reading the boldened part. I have no idea what this guy is saying. Could you help me with this?

[Tdol]

Justic is punitive and hurts- it's getting your own back.