That creature was enormous.
A centaur but not the graceful horse-bodied ones from the mythology books he'd half-read in high school. This thing had the lower body of something between a horse and a massive dog with thick legs built for power rather than speed and an upper body that looked vaguely like an oversized kobold with long arms and a flat face full of teeth. It was holding another fire spear that was materializing in its right hand, condensing out of the air like someone was building a weapon out of pure heat.
Its eyes were intelligent and very angry. Behind it Eren could see more of them, at least a dozen centaur shapes moving through the trees further back and this one was clearly the alpha because it was the biggest and it was the one standing between Eren and the fruit trees.
