Randomdude
Paramount
Honestly sounds more like they just didn't think about it/what it could imply (Though without more context hard to know, but considering how messy some of rwbys writing has always been "Mettle" I could easily see them thinking itd be really cool to shake the vault to show salems coming and just...Not thinking about the logistics of that),you're not going to get a good faith answer here but the latter is technically true (although it's not really quantifiable)
iirc she shook the Vault in Atlas in Volume 8 despite not being IN the Vault (which is in a different dimension) but like
yeah that's not really quantifiable
What the fuck makes them ftl? Ive seen some of these fights and nothing I saw looked like it'd go higher then hypersonic.
Edit: Wait im betting it's fucking lasers