Every Champion that is on a killing streak will give their killer extra credits to spend. If you are on a streak SOMETIMES it may be worth jumping of the map before Lex can make you his retribution target and gain even more credits.
Assuming Buck hits you at point blank with all his pellets in the head, he will need 3 shots to kill you.(2.8s) This will never happen. You can knock buck down to 500 HP with the Daggers+Pounce+Daggers combo (about 2s). Easy kill from there.