I HAVE A THEORY: so after beetleguard, that same beetle started eating more and more and became beetleattack, then that beetle started to go after goverment devices in hopes to learn their secrets in order to become king! we know that the beetle is intelligent from the previous game and so it sends out a distress signal, but then the beetle kills whatever comes after it. This theory is supported even more by the fact that the name is "it grows" (the beetle) "signal" (The beetles signal) that is all. btw dont take what i say as canon