The £500,000 paid to Sam

Just a quick question about the £500,000 Sam demanded at the eleventh hour before agreeing to leave the club.

Was he paid the money as representative of Langston and therefore comes off the debt?

Or was it paid to Sam?

And if it was paid to Sam what was it for?

Or was it just greed?

Perhaps those in the know could clarify the basis on which this payment was demanded and paid?