Before Giles could actually say anything, he needed his normal routine of polishing his glasses, until the Englishman the offered a cautious, "Ah, the dispatching of her foe was properly done, though I must say, the resulting celebration performed by that young lady was somewhat…overenthusiastic."
Bestowing his wickedest grin upon the confused older male, Xander genially jeered, "Or like the rest of us who don't hail from the land of fog and tweed, you could've simply described Miss Brady as being a hundred times perkier than a sugar-loaded Buffy ever was! Even after your Slayer back then finished off a hard night on the Hellmouth by laying waste to an entire ice-cream shop, and afterwards gulping down ten gallons of coffee in one big swallow!"
Giles thought about what Xander had just said, along with remembering the reassuring fact that the older Summers sister was at the Cleveland Slayers House and unable even with her superhuman hearing of learning about anything her former Watcher thousands of miles away might utter regarding that very unkind remark. An instant later, even as he also allowed an identical nefarious smirk to appear upon his lined features, Rupert Giles said in a much more cultured voice than usual, "I couldn't possibly agree more, Xander."
After a short while of sharing a pleasant moment with his son-in-heart, Giles managed to point out to a still-giggling young man, "Xander, I fail to see any possible problem that might concern you. Yes, the new Slayer we just observed might take things to extremes, but time and further experience will surely settle her down. So, why are- Stop that!"
The older adult's impatient bark towards Xander now going into gales of laughter failed to stop this hilarity, causing an exasperated Giles to simmer in his chair, as he waited for that annoying child to finally settle down. Eventually wiping away of tear of mirth, Xander snickered, "Okay, I've gotta agree, joking aside, Miss Brady's not all that much worse compared to some of our other Slayers when they were starting out. Unfortunately, that doesn't apply to the rest of Marcia's family."
As Giles jaw dropped in shock over what he'd just heard, he dazedly watched Xander punching the remote to bring up another video file on the computer monitor. During this, the one-eyed man dryly commented, "Remember what you said a few minutes back, about the M'zrintan demons possibly producing weird side effects on the ordinary humans stuck in their time loops? Well, guess what? It turned out to be absolutely true, and here's example number one."
Following Xander's gaze, Giles now watched what was on the monitor. There, he saw another vampire standing alone in the basement cell, with that monster warily looking around in his puzzlement for a few moments. Until right after that, the steel door at the other end of the room then slid open, and a second young girl stalked into the area. Bearing a close family resemblance to Marcia Brady, albeit having more youthful features that were at present extremely annoyed, this child stopped short in her walk, glaring at the vampire that was malevolently smiling back at her, delightedly seeing his next meal over there. Who, in the next minute or so, was going to be drained dry of her fresh, sweet blood.
Except something entirely else happened. Still glowering at the vampire that was striding with evident menace towards herself, Jan Brady then opened her mouth to furiously scream at the top of her lungs, "Marcia, Marcia, MARCIA!"
At the last ear-splitting shriek of her older sister's name, the middle child of a California family had her whole body instantly transform into bright green. This manifestation was unmistakably vivid on the computer monitor, which showed in crisp focus how that young lady's hair, eyes, exposed skin, clothing, and shoes had changed in various emerald hues. The blinding ray of light that now shot from the girl's open mouth was also this exact color, though the vampire that had been advancing towards the transformed human had no opportunity whatsoever to notice this, considering that the searing green beam had flashed too quickly across the room, to then strike and easily penetrate with immense speed right through the center of this vile blood-drinker's chest. Even before a shocked look could appear on the vampire's face, he'd puffed into ashes in the normal manner of its utterly destroyed kind.
Continuing to numbly watch all this, Rupert Giles then observed how this young woman immediately turned back into her normal human appearance, while at the same time, a satisfied smirk crossed her face. Haughtily tossing back her long, once-again blonde hair, Jan Brady declared in her snootiest tone to nobody in particular, "Huh, Marcia has to actually touch those icky things, but me, I can wipe 'em out without getting all that nasty dust over my clothes!" Snickering to herself, the girl shown on the monitor then spun around and swaggered out of the basement room, leaving this area empty, at which point Xander turned off the video file.
Glancing over at where Giles was still gaping at the monitor, Xander loudly clearly his throat, which finally attracted the older man's dazed attention. Wryly shrugging, the New Council troubleshooter explained to Giles gazing in sheer disbelief at him, "The best that the big brains who figure out this stuff could come up with was that Jan Brady is now the living embodiment of jealousy. Nobody has any idea how that's possible, or if there's a way to turn the kid back to normal. Not that she really wants to be like anyone else ever again. Once Jan found out she could do things her big sister couldn't even after becoming a Slayer, that girl told every one of our researchers, mojo-users, and scientists to leave her alone. She did promise her mom and dad she'd be careful with her new power, and so far, that's happened. It helps that it doesn't work until she utters the key phrase you heard. Still, we just better pray that in the future, nobody on our side makes that specific Miss Brady jealous about them."
"Indeed," Giles managed to utter in his most strangled tone, shaking his head in amazement all the while. Shooting a wary look at his sardonic companion, Giles suddenly experienced the dejected feeling that things weren't over yet. A sentiment that promptly became accurate, when Xander once more pointed with worrying zeal his remote at the computer monitor, and then gleefully intoned, "Okay, example number two."