High King Maulgar // Krosh Firehand incorrectly timed Spell Shield

[papoolee]

The encounter should ideally be like this:
Mage Pulls Krosh
Krosh puts up a spell shied (http://www.wowhead.com/spell=33054/spell-shield#comments) 30 seconds uptime and 30 seconds cooldown
Krosh shoots fire balls at the mage at a 3 second cast time, after 10 fireballs he recasts his shield.
Re-spell steal the shield and EZPZ with stamina gear.

What actually happens on Archangel:
Mage pulls Krosh
Krosh puts up spell shield
Krosh shoots a fireball and then starts running at the mage for a while and then starts casting another one
After a while, the shield duration completes but Krosh is still running at the mage and shooting fireballs and Blast novas which hurt A LOT without re-applying his shield.

What I think is the cause of this problem: his running around chasing the mage for no reason is messing with his timer of shooting 10 fireballs > reapplying spell shield!

Hope I worded this correctly, you can easily reproduce this.

[deathstreal]

This behavior is similar to High Nethermancer Zerevor (Illidari Council Mage) when Curse Of Tongues is applied to him. I remember he would run to his current target until he was in melee range, then continue casting.
Should test it out.

[Qingle]

It may have something to do with the timer not actually lining up.