This is a local two-player game. One player is a shoplifter, trying to play it cool and get past security. The other player is the watchful eye of the security camera, looking for a shopper who's acting suspicious.
Shopper: act natural and try to blend in with the crowd!
Security: watch for someone who's not acting naturally!
Because the players are seated directly next to each other, watching the shopper's fingers on the keyboard is a totally valid strategy!