One of my golf buddy hit a nasty snap hook and ended on an adjacent fairway. The 2 holes run parallel to each other with a small "forest" of huge trees between the 2 fairways. We all said his only option was to aim back towards our tee box, or take a penalty stroke and re-tee because he could not advance forward through the trees. However he knew the course well so he intentionally hit down that fairway then hit across back our green. He said there was no stake so he can continue to play on, he said he only needed to re-tee if there were white stakes between the fairways. It actually became a short cut because our fairway dogleg around the trees where the 2 greens of these 2 holes came back closer together at the end.
Is there any rule against playing on the wrong fairway intentionally?
I can understand if someone hit a bad hook or slide ended on the wrong fairway, but continue to play on the wrong fairway is just seem wrong. Bad course design is one thing, holding up the players on the other fairway should be a no-no, but it's also unfair for the rest playing a longer par 5 around the trees.