As we've already talked about, spell out "you". Just a warning since this was made prior to our PM discussion. Thanks!
I think the most usefull time to cast Arcane Blast, would be when your stacks of Stolen Time are about to fall off. Then it would be considered highest priority, to keep the stack up at all times. I know it's an uptime of 30 seconds, but there can be always situations, where u cannot cast or need to pause or be very unlucky
I was wondering if u got the stacks even if u would miss the target or the target would be immune, thinking off Hagara or Alizabal in BH, but obviously would get the cast off. I will try to get a second piece tonight, and try this out.