Bounty system is ridiculous

I was Zed playing vs a Veigar Zed (ME): - About 50 CS - 0/0/0 KDA - Did not roam and stayed in lane 24/7 to farm Veigar: - Down to about 15 CS. - Harassed me whenever I'm trying to CS - Left lane and got a kill/assist. I'm not sure which So I got killed by Veigar and then "SHUTDOWN!" and Veigar got 450 gold I came back to lane, Veigar had more CS and HE DIDNT HAVE A BOUNTY??? He had 0 deaths btw Can anyone tell me why did this happen? HOW DOES THE BOUNTY SYSTEM WORK??? WTF
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