Yes, the idea was a .22 Magnum. Apparently I just vastly underestimated the stopping power of a .50 BMG. The problem is I want bullets to actually be a threat to our lil’ huntresses, and 20 shots from a .22 being needed to take out Weiss already seems like a lot…. Also, it was not my intention to imply Ruby sucks at math in the last chapter. She just doesn’t know how the calculations for affinity work, as she’s never done this before. She basically just saw all the numbers Weiss wrote down and didn’t know the formula that was used to get them.
Also, Ruby’s Aura doesn’t constantly get drained while in her semblance. She “spends” Aura in three scenarios–when she gets hit in Rose Form, as she has to replace the Aura of her outline in the real world, when she burns Aura to empower her movement (speeding up, flying, etc), and when she comes back out of Rose Form, when she pops back in and burns off the Aura that was her outline, essentially. Summer was similar–she could spend Aura to increase the burst when she went into the Rose World so the petals she left in the real world would scatter faster, and then she’d spend Aura reconstructing herself on one of the petals, as long as she has enough… Honestly, Ruby doesn’t know what happens if she runs out of Aura while in Rose Form (I do, but I’m not saying :P), as she never has, but she doesn’t want to risk getting stuck on the other side.