Velvet was killed by Longdale as a reflex action after he'd already shot Longdale with the crossbow, and even before this it was obvious all Longdale wanted to do was escape; Longdale didn't conciously kill him as a deliberate act of betrayal.
As for Longdale cheating them, it should be added in this writeup (and the one for Longdale) that there's some question as to whether or not what Tom said was true. I know Longdale said he was "well compensated" by Mr. Christian for hiring Velvet but I don't remember him ever saying he either cheated his cohorts, or gave an exact figure of money to Tom, so now that I think about it, it could be argued Tom was just making it up to make the bad guys turn on Longdale so he could escape.
Edited 4 time(s). Last edit at 05/05/2007 12:40AM by Kooshmeister.