It's what's known as a bioluminescent burglar alarm, and just like the alarm on your car or your house, it's meant to cast unwanted attention onto the intruder, thereby either leading to his capture or scaring him away.
Det er det der er kendt som en bioluminescent indbrudsalarm, og ligesom alarmen i ens bil eller ens hus, er det meningen at den giver uønsket opmærksomhed på en indtrængende, og derved enten får den fanget eller skræmt væk.