Yup. You could close things, but the spell's resolution is that of human eyesight. And you have to recast the spell for everything you're trying to unite... so it's theoretically possible for a Xeua mage to bring back a comrade from the very brink of death back to full health. Assuming he had the week's time that it would take to cast every single one of the individual spells... that and if he carried his own weight in pine resin with him.