High school stories

"I need proof that this happened," you say quietly, as you open up your camera to take a picture and a video of them. You know what you're doing is probably the worst thing to do, but you'll love to have a one-up over that popular guy, Ethan.
As you take a couple of pictures, your flash turns on suddenly and lights up the entire hallway for a second. You see Emma's eyes open and widen as she sees you, and lets go of Ethan to show him what she saw. The disappointment on her face is unbelievable.
You have very little time before you are confronted. What do you do?