The fact that this is not the strangest thing to happen in Port Obscura (she's taking everything Grave says as fact, now, because she has no real reason not to) makes Alida frown.
She does use that chunk of gravestone to bash the thing's head in, pauses long enough for it to react, and does it again. This process of shambling things turning into jumping, lunging, moving much faster things is very annoying.
"Still, it would be nice to know what caused it. I miss France." Again, it has nothing to do with anything but she feels the need to say it. One supposes this sort of thing never happens in Tourcoin.