Eren's rampage is thwarted by the War Hammer Titan whose tenacity leaves him stumped. With Marley's military joining the fight, he'll be hard-pressed to survive on his own.
By these tremors, I'd guess Titans are fighting.
Diese Erderschütterungen …
Da kämpfen zwei Titanen gegeneinander.
D’après ces vibrations,
je dirais un combat entre titans.