Thor and Loki weren't the only ones having flashbacks to weird dreams, though at least they hadn't all (yet) had the same one; she was remembering something only slightly similar involving herself and the two of them, plus three strangers, in a bar brawl.
As teenagers.
She hadn't known them as teenagers; they hadn't really known each other as teenagers. One of the strangers actually sort of looked like a pal from high school -- but other than that, he had no clue. Nonetheless, Sif didn't put much of any stock into dreams. They were things that occurred that didn't mean anything, even if repeated ones were kind of unsettling.
"The once and future king of fencing got bowled over by a girl," she added, grinning as she rebraided her hair after taking off her helmet. "Quite literally, in fact -- though that was an accident, I wasn't actually expecting you to fall."