Activating Stopwatch or Zhonya’s now cancels Ryze’s ultimate as though he had been interrupted by crowd control.

When the original decision was made to allow Ryze to use Zhonya's Hourglass to guarantee his ultimate, we were on the fence about this interaction, but it was deemed acceptable because he paid a significant cost to access it. Zhonya's Hourglass either came later in the game, or delayed core items in Ryze's already expensive build. Now that the Inspiration tree has made Zhonya's effect much easier to access, we’re not comfortable with keeping this low gameplay interaction intact.