Zachery's prevail appeared to be simply a matter of time, but this was far from the case. Ragnar's Mutant Skill, [Blood Berskerk], was a skill that took a heavy toll on his body and drank his blood quicker than a vampire progenitor.
Ragnar's Mutant skill relied on his body having enough vitality to operate the skill for the duration he desired to utilize it; if not, he would simply die in the middle of the combat, sucked dry of any bodily fluids.
Zachery was fully aware of this truth, and he had made certain that his circumstance was with him. That was why he was in this godforsaken jungle filled with monsters.
Zachery's position on the wall, his look that suggested he was confident in winning this conflict, and his stance that said he had put down his guard were all part of a performance that ensured the scales were tipped in his favor.