Debuff and blast macro

Hey all,

I'm currently using the following macro on my mage:

/assist Paladin
/cast [nocombat] Slow; Scorch

When engaging a group of mobs only the first mob gets slowed, while the rest gets scorched. Is there anyway to adjust the above macro so that any time the paladin engages a new target while in combat that mob will also get slowed?

I used to do this with castsequence reset=target but for some reason that command keeps locking up.

The mage doesn't leave combat between mobs is my guess. [nocombat] is like out of combat I think, not sure how you can do it without the reset=target tbh. But mine locks up too :(

Code:

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/assist focus (or make your /castsequence [target=focustarget])
/castsequence rest=target/combat slow, scorch, scorch, scorch, scorch, scorch, fireball, fire blast

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This macro would assist your paladin and then slow, 5x scorch, fireball, fireblast... after being pressed over and over... anytime you leave combat or switch targets it goes back to slowing the mob then scorching.