Thugs refusing to cast buffs, help

[Cor2]

I have a couple of thugs who have been casting slime even though they have been scripted to cast breath of winter. Any advice on what I can do about it?

I am using non-cold-immune mages near the thugs to cast body etheral.

Thanks in advance for any help,
Also please post if you have had a similar problem.

[Kadelake]

Give rings of frost to your astral mages. Your thugs just don't want your non-cold-immune units to be uncomfortable.