User blog comment:Leyrann/Why Chalice of Harmony is OP/@comment-86.8.9.144-20120827124900/@comment-4834593-20120828055521

^Well, few times means about 3 times. Most champions will indeed survive that. Also if you, which is bad but will sometimes happen, too early activate your stun, and then don't manage to close the gap to jump. Or if you use an extra W or Q to get a last hit you'd have missed.

Against about everyone with sustain Jax doesn't have enough mana, I think. And then that also counts sustain from items like Wriggles Lantern.