Will vine arrow also prefer to target bigger size enemy like paralyze spells? if yes, maybe it is a nice spell counter sc, if you have mass mages casting vine arrow. N1 mage is quite easy to obtain.
About a year ago KO said that spell targeting is based on unit size and squad size. I don't remember any additional details about his response. (It will happen to you too someday.)
__________________ Men do not quit playing because they grow old; they grow old because they quit playing. Oliver Wendell Holmes
It's probably to do with likely number of hit points affected. So spells that kill or immobilise go for the biggest target (assuming they're likely to hit), and AofE spells factor in the number of targets they'ss hit.