She nodded. "C-crystal monsters..." it was all she could say. Lightning turned to Sapphire, like if he remembered something.
"We need to save everypony else." Lightning said. Star was a bit more calm now. "Err... Emerald is also here." She said pointing to a desk that was covered.
"At some point she arrived asking if she could also hide in here." Star explained Derpy smiled to them,
"We should look for Crystal." Emerald said. "She'll know what to do." "We might've a little problem with that." Sapphire replied and gave the note to Emerald.