Fralex
Explorer
Yeah, if they can't do anything else effective, ducking behind a wall is a pretty good idea. I was mainly referring to situations where they could attempt to keep contributing in a meaningful way to the fight, or at least they could try to charge first to see if they could break through the lines.
I get you. And I agree that it's ridiculous to play enemies as if they all read the descriptions for every spell in the book and know the exact number of feet any given ranged attack is limited to. My point was just that when confronted with a spell effect they want to end, some of the common things they'll try are either disrupt the caster's concentration, block the caster's line of sight, or attempt to escape the spell's range, whatever that may be.