"Depending on what we're dealing with, there might be smaller entrances - for smaller forms... even mist, it's not an uncommon tack for Vampires that can shift shape... may prove a problem unless we want to give up on any pretenses of stealth." Sherlock answers slowly as he scales down.

"Or we may have a flushed door hidden by snowfall, a closer look should tell us what we have to work with... or - perhaps the entrance is not on the building itself? A tunnel for example...."