Getting mid air Helix Glitches is really annoying because it looks like you can some of them with a normal jump but the game won't let you because it's too rigid. The LB icon for the launcher seems random to me as well. Sometimes it doesn't come up even though it should and half the time I attach onto something directly above me rather than the ledge ahead.
Speaking of annoying Helix glitches...
It took me a good half-a-dozen attempts or so to nab this one. At one point I was touching it and still nothing, which had me resort to Google as I thought that perhaps a bug had rendered it unobtainable.