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Echou, I meant that when you cast IB, you have to wait a second or two to cast another spell. When I gather them up, FN, then blink away, I have a second or two to notice if one or more mobs resisted my FN. So, from the moment I FN, with no mobs resisting the FN, I have 5-4 seconds left before the mobs break off the ice.
I understand the part about waiting a second to cast a spell after casting Ice Barrier because of the global cooldown on all spells. But that's why I mentioned to cast Ice Barrier before you start rounding up the mobs. If you want to be extra careful, you can cast Ice Barrier and wait until it's cooldown is 15 seconds. That way, by the time you finish rounding up the mobs, it will have fully cooled down and you can recast later if needed.
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Now, IF one of the mobs resist, 2 seconds or so are added, so I have 2-3 seconds before the mobs break off the ice. I usually manage to cast blizzard by then, but the mobs will be running out of the blizzard's aoe circle when I still have 3-4 seconds on the blizzard. That's what I meant :P
If Frost Nova was resisted, I would lead the "straggler" back to the frozen group. As I am running I will recast Ice Barrier (if it's finished cooling down) and then Cold Snap. Cast Frost Nova to (re)freeze all mobs and blink. If you recast Frost Nova, the mobs should be re-frozen so it should not decrease the time you have to blink and blizzard (compared to a normal pull where FN was not resisted).
And in general, if you find that mobs are reaching you before your channeling on Blizzard ends, then you did not go to the max distance before casting blizzard. Note that during this whole process, you should be on the move as you do not need to be standing still to cast any of those spells except Blizzard.
You probably already know this but I'll offer up my order of doing things just in case it differs slightly from you.
1) Ice Barrier
2) Mount
3) Gather mobs
4) Dismount and keep running/strafing. You get hit much less if you are constantly on the move.
5) Frost Nova while still moving
6) Blink while still moving
7) Blizzard
8) Second Blizzard
9) Cone of Cold while moving (I like to run towards the group on a slant so that I can hit them with CoC but be angling away from them to avoid hits)
10) Frost Nova while moving
11) Blizzard
12) Cone of Cold or Arcane Explosion if needed
Here's how I would adapt the above if Frost Nova was resisted:
1) Ice Barrier
2) Mount
3) Gather
4) Dismount + strafe
5) Frost Nova (1+ mob resists)
6) Run back to the frozen group. While running, recast Ice Barrier (if cooled down) or just cast Cold Snap and recast Frost Nova (all mobs are re-frozen and you have same time as usual before they break)
7) Run + blink
8) Blizzard, etc. etc.
So you see, there really isn't any point where Ice Barrier decreases the time you have to damage the mobs.
Maybe I'm still misunderstood what you meant though because I'm a bit slow this morning (more so than usual that is :P)