Boom!
The rankers on Oliver's team were already mentally and physically exhausted from running the battle formation extensively. So when Behemoth attacked them, nobody was able to respond to the extent of their abilities.
Three rankers died right away under Behemoth's feet. The fourth was fatally injured because debris fell on him. Only Oliver and one other guy managed to get away safely from the behemoth's attacks.
Oliver couldn't assure his safety for long, however, because a certain demon beast was waiting in line when the safety barrier cracked. He swooped down from the sky and picked up Oliver as if he was catching a fish from lake water.
"Where you going, bitch? I told you I'mma dine on your carcass."
Kiyeeeh!
Shrouded in red lightning, Argo appeared at the scene and grabbed Oliver by his shoulder with his claws. The beast had managed to mimic Eren's movement spell to some extent. He also used his natural gifts and wind-element attainment to enhance his speed.
