The hit box for that mob is way off. As a result, the normal method of highlighting the mob using it's position isn't doing what is expected.
I should be able to fix this, but I have to make changes to input and skill casting, and then make sure trying to highlight mobs from the center of their model instead doesn't break anything else too badly. I'll try to get out a fix before the end of this weekend.
Beta #944 is now being built with changes to address this issue and any other combat issues arising from similar circumstances.
ExampleRoutine has been changed to attack the position that corresponds to the center of the model rather than the object position, which was at its feet.