Going All Out
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The power that Blake unleashed was one of his strongest techniques, which he had yet to name, but it was merely enhancing his spear with a lot of demonic energy and Blood Ki to unleash a slashing burst attack. Coupled with the debuff to Erdrich's stats provoked by [Intimidation], it was more than capable of putting down the half-demon boy, especially because his body was sustaining an immense burden through the incredibly strong transformation he was using.
Blake knew how to weaken his enemies before striking them down, it was a strategy he always used against strong foes, it was most of the time impossible to overpower a stronger enemy with just sheer will, and it was something only portrayed in fantasy books. He knew very well that to strike down big guys, he had to play it nasty.