It's not something I have any direct or anecdotal experience with, and I'm certainly not an attorney, but I would think that the outfitter would need to seek redress only through the landowner who could certainly charge such a former client with trespassing. However, I suppose it's possible that the language in the lease itself could delegate the ability to make a charge of trespassing to the lessee. If they take the matter into their own hands ("run the trespasser off", etc.) though, they're likely just opening the door for bigger problems.

All things aside, it's incredibly poor judgement - in my opinion - to trespass on privately-owned land, whether you're a former client or not.

But, on the other hand, three times I've encountered "professionals" who were absolutely convinced that no one would walk like we did to greet them on the public side of the fence bordering their easy-access private lease. I doubt they could have found their position on the map if I'd drawn a circle around it for them. I mean, how cool is it to not have to get out of the sack at 0300 for a three-hour hike when instead, you can sleep in, have a good breakfast, and ride ATVs up to the fenceline and get onto public land the easy way?