The next weekend, they pack snacks, she disillusions Feral in case there are people who can see them who'll happen to look up as they pass, and Bella dutifully signs them off-campus and estimates that they'll be home by dinnertime - she expects them back much sooner - and they are off to Santa Cruz.
"I - I broke Sherlock's Patronus. I was explaining it to him and - he can't even get an owl now, let alone a person."
"But I guess I'd better not try to explain to anyone else, huh?" mumbles Bella into his shoulder, hugging him. "You were lucky, Sherlock wasn't - I don't know what the odds anybody else will be are. I don't want to break Tony's or anybody else's. Regular Patronuses are better than nothing."
"Yeah. Maybe he'll get it back sometime but I don't know, he probably just tried and tried all night after I fell asleep without a break, if it was going to come back he might've managed it then."
"I mean - ask him if he thinks more trying could get the owl back, I guess," says Bella. "I don't think there are other spells that work on the same principle, or anything."
"I didn't know it was even possible to break somebody's Patronus," she says in a small voice.