This trick is one of the core aspect for V's section it enables him to jump straight to the end level most of the time in order to eliminate RNG factors in the run.
General Notes
To perform, time the jump and Air Taunt so the spear punshes V forward before landing on it. The key of it's consistency depends on the sound cue.
When it comes to standing on Shadow's spear 120 FPS gives the best result of clipping OoB where 60 FPS require runners to clip to the left or right.
This means PS4/Xbox One runners will have to find specific setup for each missions excluding Tunnel Skip