Garen was aware that he had been recently oppressed by the Divine Wind General's terrifying Willpower Energy Field. It caused his entire body to collapse and a lot of internal and external bleeding. His Crouched Eagle Talon that was also a important element of his resistance was immediately destroyed as well, leaving him with only his Level Two NIS Energy Machinist Willpower. Despite being a Level Five Mech Pilot powerhouse earlier, he had completely turned into a normal Level Two Energy Machinist. Moreover, he could not be considered as a true Energy Machinist because he did not have his own Energy Machine Imprint and biochemical pool.
If someone were to ambush him again, a single Willpower attack from a Level Three Mech Pilot was all that was needed to get rid of him immediately. The Willpowers of Energy Machinists were simply not designed for combat.