"Warding is probably your best bet," said with utter certainty. "A ward is a spell of protection, usually cast over a place. Wards show up in various established magical traditions--blessings over buildings show up a ridiculous amount. Hell, you could even view something like the horseshoe over the doorway as a primitive ward to begin with."

Strange pauses for a moment, as if mulling something over. "There is a book that has a fairly in-depth chapter about the history of warding and modern applications of warding in various real-world pagan circles. The library doesn't have it, no surprise since the selection is terrible, but I've got a personal copy back at my apartment. We could meet up somewhere and I could lend it to you, if you want."

Most importantly, they could meet up somewhere less crowded and less public. Besides, this gives him enough time for Strange to work a spell of forgetfulness should it turn out that he's barking up the wrong tree entirely and Lambert really is just a nosy kid with a weird interest in the supernatural.