Just like...
Start the hunt:
"hey, go hunt something"
Turn switch [x ] on
Then have an enemy hunt with the condition "switch [x ] is on"
Then have another page on the enemy with condition "switch [y ] is on"
Then to end the hunt do:
"Hey look you killed it."
Set switch [y ] on
Just basic switches :/
See Missingno's switches tutorial (I think he made one anyway).