You knocked on Tim's door, and you heard him on the other side struggling to do something. he yelled out

"Just one minute, I'm trying to g-"

You heard him fall over with a bang on the floor, you open the door to see him on the ground wearing a suit. it looked like....robins suit, not like some cheap Halloween costume one, it looked like the real thing

"I can explain, okay. don't freak out!"

he said, getting up off the ground, half undressed out of his suit