Pass Orc: Take Marta's pad (at the beginning of the cave under the rocks), then take it to the place where Martha pisses. Then the smell will be very strong and you can take the wet pad and throw it next to the orc.
Orc must kill from the fifth time.
I, like others, was struggling to get passed the orc. I was surprised when you said "at the beginning of the cave under the rocks" because I had gotten a game over just by walking there and never went back.
So I went back, and found the pad. The game made a comment about how maybe the orc will be distracted by it, so I went to try bypass the orc, and it didn't work. So I went to Martha's piss like you said, and got an instant game over again.
This was weird so I experimented a bit. There are 3 paths blocked by the Orc, right? I'll call them left, center & right. Going to either the left or center path, then going to the piss, causes an instant game over. Going straight from the pad to the piss works, and going from the right path orc path to the piss works. Going to the center Orc path, _then_ the right orc path, _then_ the piss also resulted in a game over.
Not sure what the exact bug is here, but something is buggy and is likely to explain some players frustration here.
Edit: After getting the piss-pad, going to the center path, then going to the shiny spot on the right path resulted in an instant game over as well. So to other players, I guess always use the right path when approaching the Orc.