You were alone in Thunder Science, walking through the halls of an upper floor of the tower. Since it wasn't really used for much at the time, it was vacant. Though, you heard some footsteps beyond a corner, so you slowly approach and bump directly into a guard

“JESUS… Christ. You scared me!” The guard said, tossing his arms up.

“So, what are you doing up here all alone?” He said, while pointing directly at you, it was hard to tell if he was happy to see someone up here or not because of his mask obscuring his face.