If I were you, I'd use in places with Fewmi, and avoid in places with the power ranger wannabe or (ironically) Lorenzo. If in a place with both, take into consideration your hunger, curses, health, and spacing skills. If you are healthy and don't want to waste time with fires, take the mask. If you think you have to use Mask or Lorenzo's attacks to I-Frame through ghosts, don't use the mask.