Honestly, even Benjamin would have to admit that freezing his opponent was sort of by chance.
With the zombie bull’s ability to come back to life and turn his attacks against him; he knew that his battle was not with the bull before him, but the entire ruin.
Unless he destroyed the entire ruin, there was no point to it.
Luckily, just as the explosion happened, he could sense a strong force that turned his surroundings green. At that moment, he had an epiphany and the idea just popped into his head.
The zombie bull needed the green light to power it, and the green light needed the zombie bull as a kind of host to use its limitless power. And so, if he were to break the connection between them, wouldn’t that solve everything?
Of course he knew that severing the connection between the zombie bull and the green light would be no easy feat.