Look good to me. As you're examples illustrate, this verb usally occurs in the 3rd person. I find that "fit" can be fairly idiomatic in some phrases, like "fit fragor" means "there was a thunder-peal."
It can also mean "to become [something]." In Ovid (where the fragor line is from too) you get "fit lupus" to describe how Lycaon suddenly transforms into a wolf. No surprise, you see it a lot in the Metamorphoses
"Ut lenita dea est, vultus capit illa priores
fitque, quod ante fuit: fugiunt e corpore saetae,
cornua decrescunt, fit luminis artior orbis"