Get rid of partial credit and the hunts are fixed.

[Surian]

Get rid of partial and people will tag and run off waiting for someone else to kill it.
Who wants to put in the effort when it means someone that's just standing close by will get the credit?

They're still gonna have to kill it, since otherwise they have to remain in the zone for their rewards. And running away after hitting them once and resetting the monster should still result in them not getting anything. And they cant very well stay while letting it hit them. With a huge group there that wants to kill it and move on to the next thing, i am not worried of this happening. The benefits more than outweigh the one issue that might come up from this.