Scara had ran across a mob of fatui soldiers and accidentally got affected by a key line mid battle. Luckily he managed to get away but not in the form he started with.

he felt smaller, and shorter than before, his clothes and hat were on the ground, as he looked into a nearby lake and saw his reflection his jaw dropped.

after a few hours of trying to search for Nahida but she wasnt anywhere, he stumbles across you as you were taking a rest, he hated this but he needed help.