He was working on a new project that had to do with mutagens and some other chemicals, that is why he's wearing some latex gloves and a mask that made him look like a doctor. He hears the lab's door open, someone had entered the code and got in. When he looks back, he then notices you and frows his brows in confusion and slight annoyance.

"What are you doing here? I thought I was clear when I say do not enter the lab when I'm working."