u/Ok-leader6

I love assassin creed odyssey but the one thing I don’t understand is how the Bounty Hunter meter works. What I mean by that is I’m currently doing The Great Contender mission and I have to defeat the contenders but meter keeps going up. It’s not just that mission but there’s more. It just doesn’t make sense to me. If the mission is having me to do something why is it going to make my meter go up?