Wolfgang nods, and speaks in whisper-soft Latin. "I can, but I don't think it's a good idea to start waving my hands around and speaking in Latin around these pilgrims." He looks around purposefully, pointing into the woods, and speaks a little louder, "Let me go and see to necessary business, I'll join you shortly."
He walks off into the woods, and actually does as he said he would, then wanders far enough so he won't be seen or heard, and casts a spell. He returns, quietly, and rejoins his companions. He nods at Marcus, and lets the other magus lead them into the cave.
InVi 10 Base 1 (sense vis) +4 sight +1 concentration (or sun if he rolls high enough to cast a 15th level spell)