It usually hits Port Angeles, inspires arson, and then if allowed spins off a familiar that does the same in Forks. She's tracked it back far enough that she can reliably head it off before it makes that fellow set that apartment building on fire as long as she hops in the car without doing her hospital exit paperwork. If she's lucky, this time she's early enough to nab it before it lights up the bakery, too.
...The fuck is that? It's not usually there.
She takes out her notes on Day One Evening and her movements. She then starts leaping around quite brazenly building to building in a search pattern.
It's going to take her a while to find what she's looking for, even using her soul gem to dowse. But eventually she locates Day One Evening in a suburb.
"Found her. Do you see anything?"
"I might wanna spend the rest of this reset in space hanging out with you talking physics," she remarks. "Does that sound fun? I'm gonna go kill this witch."
"Depends on what you saw. That was either me going into the witch's little magical habitat, or me pausing time."
"Only slightly. Covering the globe myself post-reset when all the scanners are gone will be a pain in the neck and it'll only tell me when some other puella magi engages a witch, not when one's going unhandled."
"Yeah. Park in high orbit where nobody can shoot at you till you've found the fuel you're looking for."
"I was nearly finished a D-fuel scanner, but you showed up and were all - distracting. So now I'm gonna finish that, make your witch-battle-starting scanner, and then start a search pattern over the globe. Do let me know if you need to be in a place to kill another witch, psychological problems are nobody's friend."
"I mean, I'm to the point where I can kill two, three witches a day if nothing interferes with me driving around, but then I reset and everyone's back where they are the morning of Day One. I don't know how to save the world and stop resetting, yet. Once I figure it out I'll do a perfect run. Until then it's just practice and harvesting grief seeds."
And he goes to the workshop and works on things.