Eren was sweating hard. And swearing hard. And running hard. And nothing was working.
Kimmy was making him run after him in the woods. On 3DM in the boiling heat at two in the afternoon.

And this guy was fast. Lazy, sure (he made Eren get up to fetch water each time he was thirsty at night), but pretty fast. His movements were a brown blur dancing through the trees, way, way ahead of Eren. It didn't exactly help that Eren knew failing would mean looking for firewood at five in the morning.
He was on the verge of giving up when he caught a brown flash out of the corner of his eye and his 3DM's string...

Disappeared.

He was hanging on to one of those hairs; those weird strings, at leastfifty or sixty meters above the ground. His grip was getting looser and looser. His hands were slipping. He knew what Kimmy wanted him to do now.

Biting into his shoulder with a violent twist of his neck, he transformed.