Although he didn't defeat that squad at the same speed, he could while use Explosive Impact, Ethan still did it before the nearby squads could surround him. Since fighting while using everything around him as a weapon was quite relaxing, Ethan chose a squad lizardmen equipped with spears to be his next target. However, before charging, he confirmed Lili's position and the fact that no monster was targeting her.
"I guess even though the necromancer can feel my presence, he can't exactly feel every single thing. Most likely, he can only feel the mana when his zombies are being attacked… maybe if I focus on using only my stamina, then perhaps… no… that will probably make my sword lose its durability at a stupid pace."