Does Zhonya's Hourglass prevent the opponent from getting a point from Draven when he wins combat, and does it stop Deathknell effects?

Ruling: Zhonya's Hourglass stops Deathknell effects because the death is replaced and never happens. However, Draven still wins the combat and the opponent gets the point, because winning a combat is different from causing a death - the attacker still conquers the battlefield even when the defender is recalled by Zhonya's.

Nuances:

• "Win a combat" is distinct from "conquer" - you can win multiple combats at a battlefield in a turn but only conquer once
• Since Zhonya's recalls the unit and the attacker still conquers the battlefield, it counts as winning the combat
• Sett also stops Deathknell effects in the same way as Zhonya's