Sam and Dean will have to keep Jacob quiet if they spot the tiny burrower watching them (probably catching the borrower at some point out of sheer surprise before they realize the little guy is harmless). The field borrowers will have a hard time with how big Jacob is. How can that be a living person? It’s too big for comprehension! Just one wrong move on Jacob’s part can wipe their entire burrow off the map. (Living natural disaster; Jacob Andris)