are you kidding me? Bruiser is only a core unit. They get ripped apart by 8 mercenaries, 8 minotaurs, 8 shabtis etc. Or 25 seekers with dragonseeker, 25 gnasher herd, 35 feral orc eadbahsers paired weapons or imperial guard with all the buffs, they hit on 2+, wound on 2+, hatred and battle focus and 5+ Aegis. Any good size combat unit destroys it.
And since a dragonseeker is only a character, you should be able to block the dmg from the unit with a char with saving throw (bsb with trolleater or shaman with 4+ regen). We are not that kind of easy victim you are implying here.