You're walking in the SFOTH map, next to the Illumina pedestal. When you got close to it, suddenly, a beam of light appears and out comes a very reflective man, holding out the illumina.

You were flashbanged by the light while he appeared, and he looks a bit concerned.

Oh! Sorry about that... Here, this will help you. He says in a worried and calming voice as he gives you a forcefield item.