Fox buff itself if it dies before 8:25; nerf itself if it dies after 8:30.
Having overlapping cat and fox is a serious issue for all active players of the time period. If top players go to quiz instead of fox; it most likely won't die before 8:30; which result in a big hp and reward drop on Friday, for everyone who attend fox.
This means top players are forced to lose significant rewards regardless of what choice they take; when compared to not having overlapping event times. And if top players chose to take the quiz, everyone else also lose out on rewards.
Currently, optimal fox exp/coin gain would be to have him die in 8 - 9 minutes. If even one top player go to the quiz instead, it will go past 10 mins for a big nerf next day, where you will only get ~60% of the rewards you'd otherwise get.