No, they are stupid because they should know that they should never stop running when a necro can aim at them. Also, when changing direction, don't do sharp turn, don't run into cracks in blood moor, don't click on rocks and hidden stash.

With some amount of Frw, it's not possible to be trapped by bone prison. Sure, you can cast bone prison on them, and it will surround them, but it will have always have room for they to escape (from the b. prison) if they were running in the right way.