Short version: Dash jumps into a zip line restore 1 stamina and still apply the effects of kinetic dash and arcane surge
Long version
If you have zipline set to spacebar you get stamina back when you "unintentionally air jump" to grab the zipline
this is to prevent people who have not unbound the zipline from wasting stamina presumable
but if you have Kinetic dash or Arcane surge you can
look at the zipline dash forwards and while still looking at the zipline hold down space bar at the time you'd normally "dash jump" you will get the effect of arcane surge or kinetic dash and also recover the stamina from the zipline
its niche but kinetic dash is rather abusable with this on low ammo characters removing the need to reload and even being able to get to 100% uptime on a character like haze
Long version
If you have zipline set to spacebar you get stamina back when you "unintentionally air jump" to grab the zipline
this is to prevent people who have not unbound the zipline from wasting stamina presumable
but if you have Kinetic dash or Arcane surge you can
look at the zipline dash forwards and while still looking at the zipline hold down space bar at the time you'd normally "dash jump" you will get the effect of arcane surge or kinetic dash and also recover the stamina from the zipline
its niche but kinetic dash is rather abusable with this on low ammo characters removing the need to reload and even being able to get to 100% uptime on a character like haze