It seemed that even for Adam, it was a completely reckless risk that would have ended in his death.
During the previous strike, the Head Golem did not attack at full strength, and Adam was fully prepared for this punch. However, even under these conditions, he was unable to remain standing and received numerous wounds along his arm.
Moreover, the Head Golem didn't even need to do anything. He attacked Adam only because he respected his desire to go through this trial in such a brutal way.
If the Head Golem had done nothing and just watched Adam, then in just a minute, Adam would have turned into a piece of ice, and his heart would have stopped.
However... It wasn't a risk, at least not from Adam's perspective. When the Head Golem attacked him for the first time, even if only for a moment, Adam saw it, he saw the ancient energy trying to enter his inner space.
