using chain lightning on some wolves i inadvertently hit the druffalo from the quest where you return it to redcliffe farm - but did so before i had the quest, the thing goes down to 1 health then no more, spent about 5 minutes with all 4 characters letting rip with eerything, and this druffalo chasing us on 1 health, then i figured it out, bioware could have made that druffalo non attackable they havent even bothered fixing the mosaics in Hinterlands