Shouldn't Sumomo be really, really dangerous to fight? I mean, she can use shadows(?) to basically phase through and strike. Michael is an Archangel and had to use some weapon and an assistant that could read minds and even then she almost got clawed the fuck up. And this fight is at night... in the open... Couldn't she just teleport behind them and say, "Nothin' personal, kid..." emerge from a blindspot and slice them in half damn near instantly?
Unless chibi there just made the area a perpetual winter storm, these two should be quite fucked. Although knowing this series, they sadly aren't going to be dismembered and left to die, slowly, in agonizing pain. Motherfuckers hurt Iona, however, so they damn well better pay.