Beta knew from gathering that animals were great at sensing danger, and silent birds were not a good sign. As for the buzzing, she had no sure way to know what it was, but from the lack of bird noises, it can't be good, "Remi, warn the guards that something is appoarching, and then find your parents," Beta says, suddenly with a serious expression, she starts going through her supplies. She knew that the buzzing had to be a threat, "Ice slime: Defense Phase: Hide," The Ice fist goes back into the grass, though the grass is still frozen.