I think we are both at cross purposes here. I'm not saying you should repeatedly tell someone they are doing it wrong.
What I'm saying is rather than watching someone go wrong and telling them what to do or shooting.
Go back to the start with them.
It's easier to make a jump when you have someone to follow.
And you saying the piston room is a path, it's only a path if you know the route.
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Piston room is just a path. You go straight and there you hit what appears to be a dead end, except there's platforms going across the gap, with nowhere else to go one will assume this is the way. It's a path. You'll follow that and your path will end up going left. You follow that to the next dead end, you turn around and yet again there's only one direction to go *unless someone is just going to retrace their steps* And idk, I still think just flaunting your jumping skills in their face is more harm than good. Like I said, they know the jump they just can't make it. It's not a simple case of "monkey see, monkey do" there's no eureka moment of "Oh! I'm suppose to press X to get over that gap!" *which is the kind of thing I had been referring to when I was saying that pointing out the ledge would be an asshole thing, because it's obvious and they are trying it already*