<has a look> How bizarre. It looks clear to me that it's an אֶתְנַחתָּא clause with a קָטוֹן in place of the אֶתְנַחתָּא; and I personally would leyn it as such, but I'm not an expert. (I also can't say for certain whether you should leyn the קָטוֹן as an אֶתְנַחתָּא or as it's written.)