This is actually pretty alarming, because despite having been aware of the fact that beings from the outside had managed to get in, Pru has really just been assuming that it was some angels or demons that promptly had their memories wiped, or who were hiding for some reason. Someone just straight up saying they're one of the outsiders causes her eyebrows to shoot right up.

"You're... what?" And then something pings her memory. Zangetsu is the one that had written her that absurd letter, under the veil of an angel named Mamaroth. He hadn't even been invited, but...

"You mean you actually came from the outside?"