There are tons of posts about this out there about how broken archer mobs are, and they've all been closed or resolved but these mobs are STILL doing it.
Specifically, the Svartalf Infiltrator and Svartalf Foister in Malmohus are not interrupted by ranged spells, unlike their caster counterparts. It's impossible to kill a yellow one as a solo caster unless you can 1-2 shot it. If not, your single quickcast is not enough to take it out before it kills you.
Whereas the Icestrider Interceptors, a casting mob, are properly interrupted when casted upon during their cast.
Specifically, the Svartalf Infiltrator and Svartalf Foister in Malmohus are not interrupted by ranged spells, unlike their caster counterparts. It's impossible to kill a yellow one as a solo caster unless you can 1-2 shot it. If not, your single quickcast is not enough to take it out before it kills you.
Whereas the Icestrider Interceptors, a casting mob, are properly interrupted when casted upon during their cast.