iPad as a lamp

I typed in the last 500 words of chapter 12 of AOT and wrote 700 words of SAASA chapter 5.

While waiting for my wife while she taught I was writing SAASA in the car, using my iPad as a lamp because it was dark, two ladies knocked on my door. They asked me what I was doing because I had been spotted over the last few weeks outside different people's houses. I had to convince them I was a writer waiting for my wife. I wonder what they thought I was doing?