as said/ he's got to go back.
if it is police, you can probably be damned sure there's at least one more, covering the first, else i really don't know what cops are paid for, very first thing if you're trying to stakeout, you gotta have more than one angle. else they'd jsut be putting cameras into the woods for people to put on ebay.
and even if it's not the police, i wuoldn't go back! as said, if you can't walk away from your grow, you shouldn't be doing it out there.
in regard to the pigs ripping it all down already, as said, how big is the grow, as if it's large enough, they could quite possibly want to know who it is as well as where it is