Blood Armour Weakness
When Brock looked over at the six spiked Dalki's corpse on the ground, he believed that Richard had managed to find a way to defeat it, overpowering it by finding some sort of weakness.
The truth was, Richard had done no such thing.
In the middle of the fight, the Dalki had fallen on its own. There had been next to no interference on Richard's end. After his attack had managed to slightly damage its hands, it had started to become more and more aggressive, seemingly having become berserk.