note: the way i read the 'light' cantrip, if Veit casts it again, for example on something of Portia's, the previous spell on Claus's sword would terminate. it doesn't mean that would be more useful this way at the moment, but something to remember.
also, we have torches (Veit Claus) and a hooded lantern (portia), so those are always an option
Good point. Veit, don't cast light on Portia's weapon. It's light up there but dark down here.