The intersection turns out to be in an industrial and somewhat run down section of town, insofar as such things exist in Sunnydale, in an old warehouse. Tamara parks a block away- if he hears her, and moves Kevin, if he takes her son away again- and walks up to the corner.
Bella and Soph are hanging out outside of the warehouse, their car parked down the street; Soph is casting something to refresh the spell on the sock and Bella's standing guard.
Tamara walks up as calmly as she can manage (which is not very calmly, but she's trying). "Hi," she says helplessly. "Anything I can do...? Have you... seen him? Them?"
"Not yet. Sock's waking up," says Soph. She puts it flat in the palm of her hand and waits for it to point its toes.
Bella starts looking for ways in.
Bella's shell knife will make short work of the chain. She does her best to keep it quiet.
Bella stalks towards them, shell in one hand, stake in the other - indoors she's probably not going to get the freedom of range she needs for the crossbow to be her best option.
Tamara digs out her emergency stake from her purse and follows them, at her best guess for a non-interfering distance.
"I don't understand why you won't-" the man hisses, and then turns around. It's definitely Charles, though his quick switch to vampface obscures his features somewhat. "You- what!" He says in Tamara's direction, ignoring the girls. "How did you find me so quickly?" He sounds deeply put out, and rather whiny. "Time to go, then." And he bolts for the door on the far side of the room.
Once he moves, Kevin gets a better view of them. "Mummy! Mummy help, let me out!"
Soph dithers. "Bella will be back with her shell knife in a second," she tells Kevin, "and then she can get the chain off you -" And then she goes after her sister.
Tamara runs over to Kevin. "Kevin, sweetheart, you're here, I'm so sorry, I don't know how he got you, it'll be okay now-"
Tamara breathes a sigh of relief. "Yes, sweetheart, I'm here." She kneels in front of him. "Hang on, let me see if I can get you loose-"
(just in case, in case charles attacked her, in case something happened)
Halfway through Kevin's lunge, his chest meets the stake Tamara's holding up practically by reflex.
(all watchers have to practice, watchers should know how to stake, what if a vampire finds them, what if the slayer's hurt, what if something happened)
With a cry, Kevin crumbles to dust.
(her baby boy, how could charles take him, he was all she had left, how could something happen)
And Tamara collapses, unable to stand, sobbing hysterically into the floor.