Tas was always interested in Hallowe'en. It was something he never had a part of as a child and when he went to live with his aunt, she tried to get him involved but he always ended up feeling like a spectator. He couldn't get behind the trick-or-treating. He didn't see the point. As an adult, he didn't drink and while he saw how much Tris wanted to dance, he didn't really know how to do that either. He was an awkward creature, he knew that. He believed he probably always would be.
Tas stayed next to Tris on Hallowe'en. He didn't belong out there with the mesh of dancing costumed people. He didn't dress up. What could he be? Sometimes it felt like his whole life was make-believe. He kept Tris safe, glaring off anyone who may be a potential threat. At most, he'd pull out a knife and play with it. He could flip it over his hands easily.
Tas had already lifted the table when Tris called for him to get it. He knew the drill. This part, at least, gave him something productive to do. He followed her outside towards her blue car.