The autobots had been out in their alt-forms, having humans, for example, Carly Watson, Sam Witwicky, Noah Diaz, and Cade Yeager ride with them while they were on a way to a different area because, yeah, why not?

So, as soon as they hit an snowy area? A freaking ship crashlanded in a forest, and of course the humans got out and the autobots transformed into their natural or normal forms, so walked Optimus, Bumblebee, Jazz, Ratchet, Hound, etc.

As they arrived where a ship had crash landed, they saw a lifeform of sort sitting up.

Optimus tilted his head, as he stopped moving.

Cade crossed his arms, because it was freezing in the snow. "What the crap is this?"