Update: Took me a couple of days to realize that they are using light to transmit light. Video camera captures light from the world and turns it into electronic signals which are used to modulate the laser beam, which is nothing more than concentrated light. Seems like a hard way to get things done.
On the other hand, this is the "tight beam" communications that is often used in science fiction stories. You need to be in the path of the laser beam in order to intercept the message, and if you do that, whoever the message is directed to will not get anything, and if they are paying attention, they will realize something is wrong. Like somebody is stealing their mail.